There is something about saying, 'We always do this,' which helps keep the years together. Time is such an elusive thing that if we keep on meaning to do something interesting, but never do it, year would follow year with no special thoughtfulness being expressed in making gifts, surprises, charming table settings, and familiar, favorite food. Tradition is a good gift intended to guard the best gifts.
Natural selection based on the differential multiplication of variant types cannot exist before there is material capable of replicating itself and its own variations, that is, before the origination of specifically genetic material or gene-material.