Problems are not stop signs, they are guidelines.
Always desire to learn something useful.
Who seeks shall find.
By failing to prepare, you are preparing to fail.
Do not weep do not wax indignant. Understand.
The most effective way to do it, is to do it.
Be kind whenever possible. It is always possible.
Only the educated are free.
Leap, and the net will appear.
Without hard work, nothing grows but weeds.
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.