It's always too early to quit.
Go for it now. The future is promised to no one.
Know or listen to those who know.
The dog that trots about finds a bone.
Without hard work, nothing grows but weeds.
If you think you can do it, you can.
Be thine own palace, or the world's thy jail.
Do not weep do not wax indignant. Understand.
Problems are not stop signs, they are guidelines.
To know oneself, one should assert oneself.
The role of the teacher is to create the conditions for invention rather than provide ready-made knowledge.