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“It may be seen, in my work, that the course which I have adopted is that followed by the natural philosopher, in order to grasp the laws that regulate the material world. By the seizure of facts, I seek to rise to an appreciation of the causes whence they spring.”

Adolphe Quetelet

Preface of M. Quetelet
A Treatise on Man and the Development of His Faculties (1842)

“The more advanced the sciences have become, the more they have tended to enter the domain of mathematics, which is a sort of center towards which they converge. We can judge of the perfection to which a science has come by the facility, more or less great, with which it may be approached by calculation.”

Adolphe Quetelet

Edward Mailly, Essai sur la vie et les ouv rages de Quetelet in the Annuaire de Vacadimie royale des sciences des lettres et des beaux-arts de Belgique (1875) Vol. xli pp. 109-297 found also in "Conclusions" of Instructions populaires sur le calcul des probabilités p. 230

“It has seemed to me that the theory (calcul) of probabilities ought to serve as the basis for the study of all the sciences, and particularly of the sciences of observation.”

Adolphe Quetelet

Instructions populaires sur le calcul des probability (1825) English translation by R. Beamish (1839)

“Having for their object the Science of Man, present difficulties exceedingly great, and, to merit confidence, must be collected upon a scale far too extended to be attempted by an individual philosopher.”

Adolphe Quetelet

Introductory
A Treatise on Man and the Development of His Faculties (1842)

“Even in respect to those crimes which seem perfectly beyond human foresight, such as murders committed in general at the close of quarrels, arising without a motive, and under other circumstances to all appearance the most fortuitous or accidental; nevertheless, experience proves that murders are committed annually, not only pretty nearly to the same extent, but even that the instruments employed are in the same proportions. Now, if this occurs in the case of crimes whose origin seems to be purely accidental, what shall we say of those admitted to be the result of reflection.”

Adolphe Quetelet

Introductory
A Treatise on Man and the Development of His Faculties (1842)

“It is only by long and laborious study, and by the comparison of a number of individuals, that it will be possible to succeed in establishing correct average proportions each age, and in settling the limits betwixt they can be made to vary, without ceasing to be accurate and faithful to nature—our first and guide in this difficult study.”

Adolphe Quetelet

Preface of M. Quetelet
A Treatise on Man and the Development of His Faculties (1842)

“A person examining too nearly a small portion of a very large circle… would see in this detached portion merely a certain quantity of physical points, grouped in a more or less irregular manner, and so, indeed, as to seem as if they had been arranged by chance… But, placing himself at a greater distance, the eye embraces of necessity a greater number of points, and already a degree of regularity is observable… and by removing still farther from the object, the observer loses sight of the individual points, no longer observes any accidental or odd arrangements amongst them, but discovers at once the law presiding over their general arrangements, and the precise nature of the circle so traced.”

Adolphe Quetelet

Introductory
A Treatise on Man and the Development of His Faculties (1842)

“We then better understand the weakness of man, and the power of the Supreme: we are struck with the inflexible constancy of the laws which regulate the march of worlds, and which preside over the succession of human generations.”

Adolphe Quetelet

Adolphe Quételet. 1981. Letters addressed to H.R.H. the Grand Duke of Saxe Coburg and Gotha, on the theory of probability. Arno Press, p. 132

“What becomes of human free will and agency? …it seems to me to involve one of the most admirable laws of conservation in nature—a law which presents a new proof of the wisdom of the Creator… It is necessary, then, to admit that free-will exercises itself within indefinite limits, if one wishes not to incur the reproach of denying it altogether. But, with all the follies which have passed through the head of man, with all the perverse inclinations which have desolated society, what would have become of our race during so many past ages? All these scourges have passed by, and neither man nor his faculties have undergone sensible alterations, as far at least as our observations can determine. This is because the same finger which has fixed limits to the sea, has set similar bounds to the passions of men—because the same voice has said to both, "Hitherto shalt thou come, and no farther!"”

Adolphe Quetelet

Preface of M. Quetelet
A Treatise on Man and the Development of His Faculties (1842)

“Expect not… that efforts for the moral regeneration of man can be immediately crowned with success; operations upon masses are ever slow in progress, and their effects distant.”

Adolphe Quetelet

Preface of M. Quetelet
A Treatise on Man and the Development of His Faculties (1842)

“The progressive development of moral and intellectual man has scarcely occupied their [scientists] attention; nor have they noted how the faculties of his mind are at every age influenced by those of the body, nor how his faculties mutually react.”

Adolphe Quetelet

Introductory
A Treatise on Man and the Development of His Faculties (1842)

“Hitherto, the science of Man has been limited to researches… respecting some of its laws, to results deduced from single or insulated observations, and to theories often based on mere glimpses; and these constitute pretty nearly all the materials it possesses.”

Adolphe Quetelet

Introductory
A Treatise on Man and the Development of His Faculties (1842)

“I would suggest… the idea of a work which should have for its object the analytic examination of the development of our intellectual faculties for each age. Now, I have aimed to present, in the work here reproduced, only an essay, only a particular example, of such an analysis, "which tends to show that the maximum of energy of the passions occurs about the age of twenty-five." The minimum is not then determined; and even when it shall be, by a sufficient number of observations, one will no more be able to apply it to any given individual in particular, than one could make use of a table of mortality to determine the period of his decease.”

Adolphe Quetelet

Preface of M. Quetelet
A Treatise on Man and the Development of His Faculties (1842)

“My aim has been, not only to go once more through the task of Albert Durer, but to execute it also on an extended scale.”

Adolphe Quetelet

Preface of M. Quetelet
A Treatise on Man and the Development of His Faculties (1842)

“I am less desirous to explain phenomena than to establish their existence.”

Adolphe Quetelet

Preface of M. Quetelet
A Treatise on Man and the Development of His Faculties (1842)

“Judgments upon books are formed with even more haste and levity than judgments upon men. Writings are talked of without being known; and people take up an opinion for or against, in consequence of decisions which it would cost them some trouble to determine the source. These are evils which must be borne with patience, and the more so because they are common.”

Adolphe Quetelet

Preface of M. Quetelet
A Treatise on Man and the Development of His Faculties (1842)

“"There are few works on political economy," said Malthus to me, "which have been more spoken and less read than mine." All the absurdities which have been spoken and written respecting the illustrious English author, are well known. Certainly, by an appeal against such decisions, he would have all to gain, and nothing to lose, before a less prejudiced tribunal.”

Adolphe Quetelet

Preface of M. Quetelet
A Treatise on Man and the Development of His Faculties (1842)

“Artists have, for the most part, bound themselves down to follow a blind routine. Noble exceptions, however, have presented themselves. Nicholas Poussin, one of the most profound thinkers, whom the arts have produced, took care to correct and regulate by the antique the proportions which Leon Baptista Alberti and Albert Durer had given from the living model.”

Adolphe Quetelet

Preface of M. Quetelet
A Treatise on Man and the Development of His Faculties (1842)

“I have sought to determine… the different relations of bulk, subsisting between the various parts of his frame; and to ascertain how far these relations become modified during his development, what they are in the flower of his age, and in what position they remain up to the instant of decay.”

Adolphe Quetelet

Preface of M. Quetelet
A Treatise on Man and the Development of His Faculties (1842)

“We aim at a target—an end—marked by a point. The arrows go to right and left, high or low, according to the address of the shooters. In the mean time, after a considerable number of trials, the butt, which has not yet been touched, perhaps, a single time, becomes so well pointed out by the marks around it, that they would aid at once in rediscovering it, if it should chance to be lost sight of. Nay, more than this; even aims the most unfortunate may be made to conduce to this end; commencing with those marks which are farthest away, if they be sufficiently numerous, one may learn from them the real position of the point they surround.”

Adolphe Quetelet

Preface of M. Quetelet
A Treatise on Man and the Development of His Faculties (1842)