Life is very short and anxious for those who forget the past, neglect the present, and fear the future.

Every blessing ignored becomes a curse.

If you cannot do great things, do small things in a great way.

A book is not an isolated being: it is a relationship.

Pure mathematics is, in its way, the poetry of logical ideas.

We must learn to distinguish between guilt and shame.

You must do the things you think you cannot do.