One of the functions of wisdom is to serve as a corrective against certain tendencies. This is one reason that ideas that are said to be "timeless" are not so at all. While people are conditioned in a certain way, a wise saying may truly be wise - helping to bring humankind away from old patterns and into a new phase of thought and action.
When "wisdom" becomes merely a saying, which reinforces the way people already tend to think, it ceases to be wisdom and becomes at best a useless plaything and at worst an obstacle to further development.
A strong medicine, taken for too long after the passing of an illness, may make the patient sicker than he was to begin with.