“Principles taken upon trust, consequences lamely deduced from them, want of coherence in the parts, and of evidence in the whole, these are every where to be met with in the systems of the most eminent philosophers, and seem to have drawn disgrace upon philosophy itself.”

— David Hume , book A Treatise of Human Nature

Introduction
A Treatise of Human Nature (1739-40)
Context: Nothing is more usual and more natural for those, who pretend to discover anything new to the world in philosophy and the sciences, than to insinuate the praises of their own systems, by decrying all those, which have been advanced before them. And indeed were they content with lamenting that ignorance, which we still lie under in the most important questions, that can come before the tribunal of human reason, there are few, who have an acquaintance with the sciences, that would not readily agree with them. 'Tis easy for one of judgment and learning, to perceive the weak foundation even of those systems, which have obtained the greatest credit, and have carried their pretensions highest to accurate and profound reasoning. Principles taken upon trust, consequences lamely deduced from them, want of coherence in the parts, and of evidence in the whole, these are every where to be met with in the systems of the most eminent philosophers, and seem to have drawn disgrace upon philosophy itself.

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David Hume 138

Scottish philosopher, economist, and historian 1711–1776

John Rawls book A Theory of Justice

Source: A Theory of Justice (1971; 1975; 1999), Chapter I, Section 4, p. 21

“In our definition of system we noted that all systems have interrelationships between objects and between their attributes. If every part of the system is so related to every other part that any change in one aspect results in dynamic changes in all other parts of the total system, the system is said to behave as a whole or coherently.”

Arthur D. Hall (1925–2006) American electrical engineer

At the other extreme is a set of parts that are completely unrelated: that is, a change in each part depends only on that part alone. The variation in the set is the physical sum of the variations of the parts. Such behavior is called independent or physical summativity.
Source: Definition of System, 1956, p. 23

“Founding itself upon love, humility, and faith, dialogue becomes a horizontal relationship of which mutual trust between the dialoguers is a logical consequence.”

Paulo Freire (1921–1997) educator and philosopher

Pedagogia do oprimido (Pedagogy of the Oppressed) (1968, English trans. 1970)

“Each of the parts of philosophy is a philosophical whole, a circle rounded and complete in itself. In each of these parts, however, the philosophical Idea is found in a particular specificality or medium. The single circle, because it is a real totality, bursts through the limits imposed by its special medium, and gives rise to a wider circle. The whole of philosophy in this way resembles a circle of circles. The Idea appears in each single circle, but, at the same time, the whole Idea is constituted by the system of these peculiar phases, and each is a necessary member of the organisation.”

Georg Wilhelm Friedrich Hegel book Encyclopedia of the Philosophical Sciences

Encyclopedia of the Philosophical Sciences (1816)

“This habit of forming opinions, and acting upon them without evidence, is one of the most immoral habits of the mind. … As our opinions are the fathers of our actions, to be indifferent about the evidence of our opinions is to be indifferent about the consequences of our actions.”

James Mill (1773–1836) Scottish historian, economist, political theorist and philosopher

The Westminster Review, vol. 6 (1826), p. 13
Context: This habit of forming opinions, and acting upon them without evidence, is one of the most immoral habits of the mind.... As our opinions are the fathers of our actions, to be indifferent about the evidence of our opinions is to be indifferent about the consequences of our actions. But the consequences of our actions are the good and evil of our fellow-creatures. The habit of the neglect of evidence, therefore, is the habit of disregarding the good and evil of our fellow-creatures.