A person may do many stupid things in his life, but the two most stupid things are: refusing to read and neglecting the soul; refusing to exercise and neglecting health.
Oaths are the most unreliable things in the world. Others will only abide by your oaths if you are still useful to others.
There is no eternal beginning and no unbearable ending. In life, what you need to grasp is: when you should start, you must start without hesitation; when you should end, you must end it cleanly.