At a School of Drawing

Artist. - Ivan Ivanovich, it`s time I paid for training, but there`s no money: I haven`t earned anything yet.
- My dear, that`s none of my business.
Artist. - You could postpone the payment.
- No, I can`t, old chap.
Artist. - And if I don`t pay on time, would you expel me?
- Yes, my friend.