You never know what motivates you.
To know oneself, one should assert oneself.
The wise does at once what the fool does at last.
What you do today can improve all your tomorrows.
Know or listen to those who know.
Expect problems and eat them for breakfast.
Quality is not an act, it is a habit.
Well done is better than well said.
Either you run the day or the day runs you.
It's always too early to quit.
The diversity of the phenomena of nature is so great, and the treasures hidden in the heavens so rich, precisely in order that the human mind shall never be lacking in fresh nourishment.