Know or listen to those who know.
Do not weep do not wax indignant. Understand.
If you think you can do it, you can.
Quality is not an act, it is a habit.
The secret of getting ahead is getting started.
Be kind whenever possible. It is always possible.
Only the educated are free.
To know oneself, one should assert oneself.
Problems are not stop signs, they are guidelines.
Things do not happen. Things are made to happen.
All the mathematical sciences are founded on relations between physical laws and laws of numbers, so that the aim of exact science is to reduce the problems of nature to the determination of quantities by operations with numbers.