The nature of matter, or body considered in general, consists not in its being something which is hard or heavy or coloured, or which affects the senses in any way, but simply in its being something which is extended in length, breadth and depth.

There is nothing so strange and so unbelievable that it has not been said by one philosopher or another.

And as it is the most generous souls who have most gratitude, it is those who have most pride, and who are most base and infirm, who most allow themselves to be carried away by anger and hatred.

Just as we believe by faith that the greatest happiness of the next life consists simply in the contemplation of this divine majesty, likewise we experience that we derive the greatest joy of which we are capable in this life from the same contemplation, even though it is much less perfect.

Except our own thoughts, there is nothing absolutely in our power.

For to be possessed of a vigorous mind is not enough; the prime requisite is rightly to apply it.

I am indeed amazed when I consider how weak my mind is and how prone to error.