Memory and forgetfulness are as life and death to one another. To live is to remember and to remember is to live. To die is to forget and to forget is to die.

In practice it is seldom very hard to do one's duty when one knows what it is, but it is sometimes extremely difficult to find this out.

There are two classes [of scientists], those who want to know, and do not care whether others think they know or not, and those who do not much care about knowing, but care very greatly about being reputed as knowing.

We all love best not those who offend us least, but those who make it most easy for us to forgive them.

Youth is like spring, an over praised season more remarkable for biting winds than genial breezes. Autumn is the mellower season, and what we lose in flowers we more than gain in fruits.

There is no permanent absolute unchangeable truth; what we should pursue is the most convenient arrangement of our ideas.

The foundations which we would dig about and find are within us, like the kingdom of heaven, rather than without.