Everything moves forward or backward, nothing is without motion. From his birth, a man progresses physically until he reaches maturity, then, having arrived at the prime of his life, he begins to decline, the strength and powers of his body decrease, and he gradually arrives at the hour of death. Likewise a plant progresses from the seed to maturity, then its life begins to lessen until it fades and dies. A bird soars to a certain height and having reached the highest possible point in its flight, begins its descent to earth. Thus it is evident that movement is essential to all existence.
All material things progress to a certain point, then begin to decline.
This is the law which governs the whole physical creation. Now let us consider the soul. But with the human soul, there is no decline. Divine perfection is infinite, therefore the progress of the soul is also infinite. From the very birth of a human being the soul progresses, the intellect grows and knowledge increases.