What a vile and abject thing is man if he do not raise himself above humanity.
Vice may be learnt, even without a teacher
The young man must store up, the old man must use.
Who needs forgiveness, should the same extend with readiness.
No man is born wise; but wisdom and virtue require a tutor; though we can easily learn to be vicious without a master.
Retire into yourself as much as possible. Associate with people who are likely to improve you. Welcome those whom you are capable of improving. The process is a mutual one. People learn as they teach.