John Ruskin

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“When I tell you that war is the foundation of all the arts, I mean also that it is the foundation of all the high virtues and faculties of men. It is very strange for me to discover this, and very dreadful, but I saw it to be quite an undeniable fact… I found, in brief, that all great nations learned their truth of word and strength of thought in war; that they were nourished in war and wasted in peace; taught by war and deceived by peace; trained by war and betrayed by peace; in a word, that they were born in war and expired in peace.”
John Ruskin, Crown of Wild Olive

Yeah, it’s not really science. But interesting.

Carl Sagan

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The truth may be puzzling. It may take some work to grapple with. It may be counterintuitive. It may contradict deeply held prejudices. It may not be consonant with what we desperately want to be true. But our preferences do not determine what’s true. We have a method, and that method helps us to reach not absolute truth, only asymptotic approaches to the truth—never there, just closer and closer, always finding vast new oceans of undiscovered possibilities. Cleverly designed experiments are the key.
In ‘Wonder and Skepticism’, Skeptical Enquirer (Jan-Feb 1995), 19, No. 1.

Francis Bacon

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For myself, I found that I was fitted for nothing so well as for the study of Truth; as having a mind nimble and versatile enough to catch the resemblances of things (which is the chief point) , and at the same time steady enough to fix and distinguish their subtler differences; as being gifted by nature with desire to seek, patience to doubt, fondness to meditate, slowness to assert, readiness to reconsider, carefulness to dispose and set in order; and as being a man that neither affects what is new nor admires what is old, and that hates every kind of imposture. So I thought my nature had a kind of familiarity and relationship with Truth.
From ‘Progress of philosophical speculations. Preface to intended treatise De Interpretatione Naturæ(1603)
Modest, isn’t he?

Roy DeCarava

It doesn’t have to be pretty to be true. But if it’s true it’s beautiful. Truth is beautiful. And so my whole work is about what amounts to a reverence for life itself.

I heard this from an artist I follow on tumblr. Of course, he’s talking about his art, but it could equally apply to any scientist. Science is motivised by a reverence for truth and for life.