Change is constant throughout the universe, STILLNESS IS NOT. Everything in the universe are moving. It is said that the Source is unlike anything in existence. In stillness we might remember the original thoughts when  we were still One with the Source.

Meditation objective in general is to be in stillness. However, the paradox is that it is hard to be calm / in stillness before we remember the original thoughts, the meaning of life in this finite realities. Enlightenment is a mystery, it can not be achieve only through the mind (or hard work), never a certainty. The Sufi said it is given just by the Grace of God.