It's always too early to quit.

Know or listen to those who know.

Begin to be now what you will be hereafter.

The wise does at once what the fool does at last.

Be thine own palace, or the world's thy jail.

Leap, and the net will appear.

The dog that trots about finds a bone.

Expect problems and eat them for breakfast.

Things do not happen. Things are made to happen.