Early Buddhism dealt with the problem of impermanence in a very rationale manner. This concept is known as
anicca in Buddhism, according to which, impermanence is an undeniable and inescapable fact of human existence from which nothing that belongs to this earth is ever free.
Buddhism declares that there are five processes on which no human being has control and which none can ever change. These five processes are namely, the process of growing old, of not falling sick, of dying, of decay of things that are perishable and of the passing away of that which is liable to pass. Buddhism however suggests that escape from these is possible and it's through Nirvana.
Buddhists
did not believe in the existence of a permanent and fixed reality which could be referred to as either God or soul. According to them what was apparent and verifiable about our existence was the continuous change it undergoes.
Thus Buddhism declares that in this world there is nothing that is fixed and permanent.
Every thing is subject to change and alteration.
"Decay is inherent in all component things," declared the Buddha and his followers accepted that
existence was a flux, and a continuous becoming.According to the teachings of the Buddha, life is comparable to a river. It is a
progressive moment, a successive series of different moments, joining together to give the impression of one continuous flow. It moves from
cause to cause, effect to effect, one point to another, one state of existence to another, giving an outward impression that it is one continuous and unified movement, where as in reality it is not. The river of yesterday is not the same as the river of today. The river of this moment is not going to be the same as the river of the next moment. So does life. It changes continuously, becomes something or the other from moment to moment.