It is bad for a young man to sin; but it is worse for an old man to sin.
He who builds a masjid in the way of Allah, God will build a house for him in the paradise.
If you want to control other people, first control yourself.
Without knowledge action is useless and knowledge without action is futile.
If an ignorant person is attracted by the things of the world, that is bad. But if a learned person is thus attracted, it is worse.
Use the same measure for selling that you use for purchasing.