Necessity

Is anything necessary? Does every effect have some real cause, or is the effect actually before the cause? When we perform any action, do we always foresee that there must be a result from that action, some perceived foreseen result? If we do, if we do believe that every action must have some result; isn't that foreseen result the actual cause of the performance of the action? And, more often than not, is the foreseen result the reason an action is not performed? If something is never done, how could it possibly be ever necessary? Does an action have a cause and an effect, if it cannot be foreseen? Isn't our own very existence such an action, without a cause or an effect, since we choose to continue it even though we believe it must end? What happens if we believe it doesn't end...does it still have a cause and effect? Could life exist for us if we choose not to believe in the necessity of the continuance of existence? What happens then if we become free from the belief in necessity?