Suppose there is a ball in this room, and we each have a mallet in our hands and begin to strike the ball, giving it hundreds of blows, driving it from point to point, until at last it flies out of the room. With what force and in what direction will it go out? These will be determined by the forces that have been acting upon it all through the room. All the different blows that have been given will have their effects. Each one of our actions, mental and physical, is such a blow. The human mind is a ball which is being hit. We are being hit about this room of the world all the time, and our passage out of it is determined by the force of all these blows. In each case, the speed and direction of the ball is determined by the hits it has received; so all our actions in this world will determine our future birth. Our present birth, therefore, is the result of our past. This is one case: suppose I give you an endless chain, in which there is a black link and a white link alternately, without beginning and without end, and suppose I ask you the nature of the chain. At first you will find a difficulty in determining its nature, the chain being infinite at both ends, but slowly you find out it is a chain. You soon discover that this infinite chain is a repetition of the two links, black and white, and these multiplied infinitely become a whole chain.