The most miserable man in the world of those meant for Paradise will be dipped once in Paradise. Then he will be asked, "Son of Adam, did you ever face any misery? Did you ever experience any hardship?" So he will say, "No, by God, O Lord! I never faced any misery, and I never experienced any hardship."
A good friend and a bad friend are like a perfume-seller and a blacksmith: The perfume-seller might give you some perfume as a gift, or you might buy some from him, or at least you might smell its fragrance. As for the blacksmith, he might singe your clothes, and at the very least you will breathe in the fumes of the furnace.
There are many doors to goodness. (Saying) 'glory to God,' 'praise be to God,' 'there is no deity but God,' enjoining good, forbidding evil, removing harm from the road, listening to the deaf (until you understand them), leading the blind, guiding one to the object of his need, hurrying with the strength of one's legs to one in sorrow who is asking for help, and supporting the weak with the strength of one's arms - all of these are (forms of) charity prescribed for you.