There are two kinds of men, one who speaks subject to his impulse, the other who speaks just like hitting a target. This first one may often strike a wrong note, and may work against his own interest, but the other one will become the master of his destiny. The one who knows while speaking to whom he is speaking, the capacity of the mind of his hearer, the lines on the mind of his hearer, he will speak the words which will pierce through the mind of the listener. It is just like looking for a track before running the cart in a given direction.