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| I tell you the truth, anyone who will not receive the kingdom of God like a little child will never enter it | | Bible | |
| I think a man's duty is to find out where the truth is, or if he cannot, at least to take the best possible human doctrine and the hardest to disprove, and to ride on this like a raft over the waters of life | | Plato | |
| I think if the people of this country can be reached with the truth, their judgment will be in favor of the many, as against the privileged few | | Eleanor Roosevelt | |
| If Darwin's theory should be true, it will not degrade man; it will simply raise the whole animal world into dignity, leaving man as far in advance as he is at present | | George Eliot | |
| If I found any new truths in the sciences, I can say that they follow from, or depend on, five or six principal problems which I succeeded in solving and which I regard as so many battles where the fortunes of war were on my side. | | Rene Descartes | |
| If one tells the truth, one is sure sooner or later to be found out | | Oscar Wilde | |
| If the truth is there, bad writing won't hurt it ! | | Alfred Adler | |
| If truth were not often suggested by error, if old implements could not be adjusted to new uses, human progress would be slow | | Oliver Wendell Holmes | |
| If what Proust says is true, that happiness is the absence of fever, then I will never know happiness. For I am possessed by a fever for knowledge, experience, and creation. | | Anais Nin | |
| If you love the truth, you'll trust it - that is, you will expect it to be good, beautiful, perfect, orderly, etc., in the long run, not necessarily in the short run. | | Abraham Maslow | |
| If you tell the truth you don't have to remember anything. | | Mark Twain | |
| In a controversy, the instant we feel anger, we have already ceased striving for truth and have begun striving for ourselves | | Abraham J. Heschel | |
| In love, everything is true, everything is false; it is the one subject on which one cannot express an absurdity | | Chamfort | |
| In order that all men may be taught to speak the truth, it is necessary that all likewise should learn to hear it | | Samuel Johnson | |
| In truth, politeness is artificial good humor, it covers the natural want of it, and ends by rendering habitual a substitute nearly equivalent to the real virtue. | | Thomas Jefferson | |
| In truth, there never was any remarkable lawgiver amongst any people who did not resort to divine authority, as otherwise his laws would not have been accepted by the people; for there are many good laws, the importance of which is known to be the sa | | Niccolo Machiavelli | |
| It is a great advantage for a system of philosophy to be substantially true. | | Sophia Loren | |
| It is a peculiarity of the American mind that it regards any excursion into the truth as an adventure into cynicism | | Henry Louis Mencken | |
| It is a truth universally acknowledged, that a single man in possession of a good fortune, must be in want of a wife | | Jane Austen | |
| It is man that makes truth great, not truth that makes man great | | Confucius | |