It's always too early to quit.
Wherever you are - be all there.
Begin to be now what you will be hereafter.
Never complain and never explain.
To know oneself, one should assert oneself.
To be a good loser is to learn how to win.
Always desire to learn something useful.
Know or listen to those who know.
If you think you can do it, you can.
The dog that trots about finds a bone.
The best way to have a good idea is to have a lot of ideas.
Satisfaction of one's curiosity is one of the greatest sources of happiness in life.
Facts are the air of scientists. Without them you can never fly.