Everything in this universe has a beginning and an end. However, we may also observe how on an even larger scale everything lives some sort of cyclical existence. The seasons revolve and change, the earth and the planets orbit the sun as the sun in turn orbits through the solar system. Everything experience growth and decay whether that be particles, planets or entire galaxies. And the end of one creation is always the beginning of another.
Man is truly the microcosm of the macrocosm.
We are ever growing and evolving from birth to death and even beyond death and even before life as we know it. We are eternal and yet we are mortal. We make decisions day after day and moment by moment that change us and evolve us into further growth or decay. When we attempt to deny this process by wishing things were different or avoiding the situation we are essentially denying ourselves the opportunity to experience life. We tend to place values and judgments on our experiences and separate the good from the bad but the reality is that life is a totality not a single slice of time.