“Age and truth. Young people love what is interesting and odd, no matter how true or false it is. More mature minds love what is interesting and odd about truth. Fully mature intellects, finally, love truth, even when it appears plain and simple, boring to the ordinary person; for they have noticed that truth tends to reveal its highest wisdom in the guise of simplicity.”
Section IX, "Man Alone with Himself" / aphorism 609
Human, All Too Human (1878), Helen Zimmern translation
Original
Lebensalter und Wahrheit. - junge Leute lieben das Interessante und Absonderliche, gleichgültig wie wahr oder falsch es ist. Reifere Geister lieben Das an der Wahrheit, was an ihr interessant und absonderlich ist. Ausgereifte Köpfe endlich lieben die Wahrheit auch in Dem, wo sie schlicht und einfältig erscheint und dem gewöhnlichen Menschen Langeweile macht, weil sie gemerkt haben, dass die Wahrheit das Höchste an Geist, was sie besitzt, mit der Miene der Einfalt zu sagen pflegt.
Human, All Too Human (1878), Helen Zimmern translation
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Friedrich Nietzsche 655
German philosopher, poet, composer, cultural critic, and cl… 1844–1900Related quotes
Knowing Yourself: The True in the False (1996)

Book IV, Ch. 19 : Of Enthusiasm (Chapter added in the fourth edition).
Variant paraphrase, sometimes cited as a direct quote: One unerring mark of the love of truth is not entertaining any proposition with greater assurance than the proofs it is built upon will warrant.
As paraphrased in Peter's Quotations : Ideas for our Time (1979) by Laurence J. Peter, p. 500; also in The Demon-Haunted World : Science as a Candle in the Dark (1994) by Carl Sagan, p. 64
An Essay Concerning Human Understanding (1689)
Context: He that would seriously set upon the search of truth, ought in the first place to prepare his mind with a love of it. For he that loves it not, will not take much pains to get it; nor be much concerned when he misses it. There is nobody in the commonwealth of learning who does not profess himself a lover of truth: and there is not a rational creature that would not take it amiss to be thought otherwise of. And yet, for all this, one may truly say, that there are very few lovers of truth, for truth's sake, even amongst those who persuade themselves that they are so. How a man may know whether he be so in earnest, is worth inquiry: and I think there is one unerring mark of it, viz. The not entertaining any proposition with greater assurance than the proofs it is built upon will warrant. Whoever goes beyond this measure of assent, it is plain receives not the truth in the love of it; loves not truth for truth's sake, but for some other bye-end.

"Packard Goose"
"Joe's Garage Acts II & III" (1979)
Variant: Information is not knowledge. Knowledge is not wisdom. Wisdom is not truth. Truth is not beauty. Beauty is not love. Love is not music. Music is the best.

https://naijagists.com/omotola-jalade-ekeinde-wisdom-quotes-top-20-motivational-quotes-sayings-omosexy/ Omotola Jalade Ekehinde speaking on Success.

The Inferno (1917), Ch. XIV
Context: I wanted to know the secret of life. I had seen men, groups, deeds, faces. In the twilight I had seen the tremulous eyes of beings as deep as wells. I had seen the mouth that said in a burst of glory, "I am more sensitive than others." I had seen the struggle to love and make one's self understood, the refusal of two persons in conversation to give themselves to each other, the coming together of two lovers, the lovers with an infectious smile, who are lovers in name only, who bury themselves in kisses, who press wound to wound to cure themselves, between whom there is really no attachment, and who, in spite of their ecstasy deriving light from shadow, are strangers as much as the sun and the moon are strangers. I had heard those who could find no crumb of peace except in the confession of their shameful misery, and I had seen faces pale and red-eyed from crying. I wanted to grasp it all at the same time. All the truths taken together make only one truth. I had had to wait until that day to learn this simple thing. It was this truth of truths which I needed.
Not because of my love of mankind. It is not true that we love mankind. No one ever has loved, does love, or will love mankind. It was for myself, solely for myself, that I sought to attain the full truth, which is above emotion, above peace, even above life, like a sort of death. I wanted to derive guidance from it, a faith. I wanted to use it for my own good.