Why don’t you sit home without buying or cocking anything and say that if Allah wills it, food will come to me without me doing anything and I will eat? Why don’t you jump from the tallest building and say: if Allah wills it, I will land safe on my feet?
No one will do such a thing because we don’t know what it written in the preserved tablet. Therefore, we act and do what we do hoping that Allah will grant us from His favors and blessings.