Without hard work, nothing grows but weeds.
You never know what motivates you.
Be thine own palace, or the world's thy jail.
Do not weep do not wax indignant. Understand.
Know or listen to those who know.
Quality is not an act, it is a habit.
Be kind whenever possible. It is always possible.
I can, therefore I am.
Be gentle to all and stern with yourself.
If you're going through hell, keep going.
The frontiers of knowledge in the various fields of our subject are expanding at such a rate that, work as hard as one can, one finds oneself further and further away from an understanding of the whole.