A secret remains a secret until you make someone promise never to reveal it.
Personal dignity is to be measured with the yardstick of one's conscience, not with that of other people's judgement.
As long as his strength permits, the poor mortal must always climb new mountains.
We learn a lot from the mistakes of others, but even more from our own.
If you are living in the past or in the future, you will never find a meaning in the present.
Your identity is like your shadow: not always visible and yet always present.