Old age is rather like another country. You will enjoy it more if you have prepared yourself before you go.

We admire people to the extent that we cannot explain what they do, and the word 'admire' then means 'marvel at.'

An important fact about verbal behavior is that speaker and listener may reside within the same skin.

We are only just beginning to understand the power of love because we are just beginning to understand the weakness of force and aggression.

Let men be happy, informed, skillful, well behaved, and productive.

Behavior is determined by its consequences.

Behavior is shaped and maintained by its consequences