“The secret of joy in work is contained in one word — excellence. To know how to do something well is to enjoy it.”

One faces the future with ones past.

Growth itself contains the germ of happiness.

Every great mistake has a halfway moment, a split second when it can be recalled and perhaps remedied.

You cannot make yourself feel something you do not feel, but you can make yourself do right in spite of your feelings.

The truth is always exciting. Speak it, then. Life is dull without it.

Happiness mainly comes from our own attitude, rather than from external factors.

Happiness does not come about only due to external circumstances; it mainly derives from inner attitudes.

The International Space Station is my happy place.