We can know nothing of humankind without knowing something of ourselves. Self-knowledge is the property of those people whose passions have their full play, but who ponder over their results.

As men advance in life, all passions resolve themselves into money. Love, ambition, even poetry, end in this.

Some will read only old books, as if there were no valuable truths to be discovered in modern publications: others will only read new books, as if some valuable truths are not among the old. Some will not read a book because they know the author: others . . . would also read the man.

Never complain and never explain.

Judaism is not complete without Christianity and without Judaism, Christianity would not exist.

The enterprise of America precedes that of Europe, as the industry of England precedes that of the rest of Europe.

My idea of an acceptable person is someone that is ready to accept my ideas.