“The field of mathematics is now so extensive that no one can [any] longer pretend to cover it, least of all the specialist in any one department. Furthermore it takes a century or more to weigh men and their discoveries, thus making the judgment of contemporaries often quite worthless.”

Source: The Letters of J. R. R. Tolkien (1981), No. 52: To his son Christopher Tolkien (29 November, 1943)

Address to the Convention (4 June 1788) http://www.wwnorton.com/college/history/archive/resources/documents/ch07_04.htm
Addresses to the Virginia Ratifying Convention (1788)
Context: Does any man suppose that one general national government can exist in so extensive a country as this? I hope that a government may be framed which may suit us, by drawing a line between the general and state governments, and prevent that dangerous clashing of interest and power, which must, as it now stands, terminate in the destruction of one or the other. When we come to the judiciary, we shall be more convinced that this government will terminate in the annihilation of the state governments: the question then will be, whether a consolidated government can preserve the freedom and secure the rights of the people.
If such amendments be introduced as shall exclude danger, I shall most gladly put my hand to it. When such amendments as shall, from the best information, secure the great essential rights of the people, shall be agreed to by gentlemen, I shall most heartily make the greatest concessions, and concur in any reasonable measure to obtain the desirable end of conciliation and unanimity…

As quoted in "The Mathematician" in The World of Mathematics (1956), by James Roy Newman

Letter to A.S. Suvorin (October 27, 1888)
Letters

Wording in Ideas and Opinions: It is therefore easy to see why the churches have always fought science and persecuted its devotees. On the other hand, I maintain that the cosmic religious feeling is the strongest and noblest motive for scientific research. Only those who realize the immense efforts and, above all, the devotion without which pioneer work in theoretical science cannot be achieved are able to grasp the strength of the emotion out of which alone such work, remote as it is from the immediate realities of life, can issue. What a deep conviction of the rationality of the universe and what a yearning to understand, were it but a feeble reflection of the mind revealed in this world, Kepler and Newton must have had to enable them to spend years of solitary labor in disentangling the principles of celestial mechanics! Those whose acquaintance with scientific research is derived chiefly from its practical results easily develop a completely false notion of the mentality of the men who, surrounded by a skeptical world, have shown the way to kindred spirits scattered wide through the world and through the centuries. Only one who has devoted his life to similar ends can have a vivid realization of what has inspired these men and given them the strength to remain true to their purpose in spite of countless failures. It is cosmic religious feeling that gives a man such strength. A contemporary has said, not unjustly, that in this materialistic age of ours the serious scientific workers are the only profoundly religious people.
1930s, Religion and Science (1930)
Context: It is, therefore, quite natural that the churches have always fought against science and have persecuted its supporters. But, on the other hand, I assert that the cosmic religious experience is the strongest and noblest driving force behind scientific research. No one who does not appreciate the terrific exertions, and, above all, the devotion without which pioneer creations in scientific thought cannot come into being, can judge the strength of the feeling out of which alone such work, turned away as it is from immediate practical life, can grow. What a deep faith in the rationality of the structure of the world and what a longing to understand even a small glimpse of the reason revealed in the world there must have been in Kepler and Newton to enable them to unravel the mechanism of the heavens in long years of lonely work! Any one who only knows scientific research in its practical applications may easily come to a wrong interpretation of the state of mind of the men who, surrounded by skeptical contemporaries, have shown the way to kindred spirits scattered over all countries in all centuries. Only those who have dedicated their lives to similar ends can have a living conception of the inspiration which gave these men the power to remain loyal to their purpose in spite of countless failures. It is the cosmic religious sense which grants this power. A contemporary has rightly said that the only deeply religious people of our largely materialistic age are the earnest men of research.

Bullshit Jobs: A Theory (2018)

"The Character of a Methodist" (1739); in The Works of the Rev. John Wesley in Ten Volumes (1826), Volume IV, p. 407; A portion of this is commonly quoted as "Think and let think.".
General sources
Context: The distinguishing marks of a Methodist are not his opinions of any sort. His assenting to this or that scheme of Religion, his embracing any particular set of notions, his espousing the judgment of one man or of another, are all quite wide of the point. Whosoever therefore imagines, that a Methodist is a man of such or such an opinion, is grossly ignorant of the whole affair; he mistakes the truth totally. We believe indeed, that all Scripture is given by the inspiration of God, and herein we are distinguished from Jews, Turks, and Infidels. We believe the written word of God to be the only and sufficient rule, both of Christian faith and practice; and herein we are fundamentally distinguished from those of the Romish church. We believe Christ to be the eternal, supreme God; and herein we are distinguished from the Socinians and Arians. But as to all opinions which do not strike at the root of Christianity, we think and let think. So that whatsoever they are, whether right or wrong, they are no distinguishing marks of a; Methodist.

Principles of Mathematics (1903), Ch. I: Definition of Pure Mathematics, p. 5
1900s
Context: The fact that all Mathematics is Symbolic Logic is one of the greatest discoveries of our age; and when this fact has been established, the remainder of the principles of mathematics consists in the analysis of Symbolic Logic itself.

Source: A Man of Law's Tale (1952), At the Scottish bar, p. 48