It's always too early to quit.

Things do not happen. Things are made to happen.

If you think you can do it, you can.

Be gentle to all and stern with yourself.

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

To know oneself, one should assert oneself.

Quality is not an act, it is a habit.

The dog that trots about finds a bone.

Know or listen to those who know.