Confucius
The superior man, when resting in safety, does not forget that danger may come. When in a state of security he does not forget the possibility of ruin.
More quotes and aphorisms
Do not dwell in the past...Be sure what you want and be sure about yourself...Of all the creatures that were made...A weed is but an unloved flower...To be, or not to be, that is the question...If you build it...