Truth, like the juice of the poppy, in small quantities, calms men; in larger, heats and irritates them, and is attended by fatal consequences in its excess.

Truth is a point, the subtlest and finest; harder than adamant; never to be broken, worn away, or blunted. Its only bad quality is, that it is sure to hurt those who touch it; and likely to draw blood, perhaps the life blood, of those who press earnestly upon it.

Truth does not lie beyond humanity, but is one of the products of the human mind and feeling.

Duration is not a test of true or false.

We say that the truth will make us free. Yes, but that truth is a thousand truths which grow and change.

To love truth for truth's sake is the principal part of human perfection in this world, and the seed-plot of all other virtues.

Truth forever on the scaffold, Wrong forever on the throne, Yet that scaffold sways the future.

Man's passion for truth is such that he will welcome the bitterest of all postulates so long as it strikes him as true.

If truth is a value it is because it is true and not because it is brave to speak it.

To believe fully and at the same moment to have doubts is not at all a contradiction: it presupposes a greater respect for truth, an awareness that truth always goes beyond anything that can be said or done at any given moment.