Contradiction is not a sign of falsity, nor the lack of contradiction a sign of truth.

If we examine our thoughts, we shall find them always occupied with the past or the future.

We sail within a vast sphere, ever drifting in uncertainty, driven from end to end.

As we speak of poetical beauty, so ought we to speak of mathematical beauty and medical beauty. But we do not do so; and that reason is that we know well what is the object of mathematics, and that it consists in proofs, and what is the object of medicine, and that it consists in healing. But we do not know in what grace consists, which is the object of poetry.

Discourses on humility are a source of pride in the vain and of humility in the humble. So those on scepticism cause believers to affirm. Few men speak humbly of humility, chastely of chastity, few doubtingly of scepticism.

The parts of the universe ... all are connected with each other in such a way that I think it to be impossible to understand any one without the whole.

Is it courage in a dying man to go, in weakness and in agony, to affront an almighty and eternal God?