Life is always moving into the unknown, and you are afraid. You want life to go according to your mind, according to the known, but life cannot follow you. It always moves into the unknown. That is why we are afraid of life, and whenever we get any chance we try to kill life, we try to fix it. Life is a flux. We try to fix it because with the fixed, prediction is possible.
You cannot be certain of the next moment. But the mind wants certainty, and life is insecurity.