Only much later did man develop the mental faculty to control his emotions with civility. All of experience is a tentative hypothesis predicting future events, which are not static entities but of a dynamic nature within a trial and error framework. There is a basic unpredictability to events. Some call it fate some call it chance. But no matter what group one belongs to or whatever his philosophy of life and religions is, he will never know exactly the moment of his pending death.
Nothing is static.
Everything in the cosmos keeps changing. We live with a philosophy that values speed, dynamics, and change. Consider the change hidden in things we traditionally think as immutable. The length of the year is slowly changing as our planet changes its relative position within the solar system. Our average life span keeps lengthening due to medical developments.