Every addition to true knowledge is an addition to human power.

Success is the sum of small efforts - repeated day in and day out.

When ambition ends, happiness begins.

If we open a quarrel between past and present, we shall find that we have lost the future.

Hope is patience with the lamp lit.

A single sunbeam is enough to drive away many shadows.

Forgiveness is the key to action and freedom.

All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.

All the knowledge I possess everyone else can acquire, but my heart is all my own.

Knowledge is like money: to be of value it must circulate, and in circulating it can increase in quantity and, hopefully, in value.