Because plunging into another element, the cold water, or greeting the sun from a height, are impressive moments, and we must do ·something to celebrate them. In bathing you have exposed yourself in a somewhat risqué costume and you want an outlet for your feelings. We always put everything on to our parents or forefathers. We make them responsible for everything and we think we have explained something by this, but as a matter of fact we have not. When we hide Easter eggs, it means that we are expressing an unconscious thought, that thought is - "Now it is the time for the beginning of new lives,” Everywhere there are young things " and we are moved by this thought as the primitives are by the rising sun.”
[Carl Jung on Affects and Customs]
Lecture VI 2nd June, 1934
Pages 110-113.