It's always too early to quit.
Be thine own palace, or the world's thy jail.
Always desire to learn something useful.
Without hard work, nothing grows but weeds.
Do not weep do not wax indignant. Understand.
To know oneself, one should assert oneself.
Be gentle to all and stern with yourself.
Never complain and never explain.
If you've got a talent, protect it.
If you think you can do it, you can.
The initial motivation of the experiment which led to this discovery was a subconscious feeling for the inexhaustible wealth of nature, a wealth that goes far beyond the imagination of man.