All the wisdom in the world cannot wipe away sadness.
Wisdom will help you understand whythe world is the way it is and it will lower your expectations of it, but it will not remove your sadness. It will also help you to avoid in future the things that will make you unhappy.
Sadness is the result of having a preference, a result of attachment.
We want a good society, a good life, fortunate circumstance. Wisdom prepares us for difficulties the way we clench out teeth and prepare for an injection that we know will prevent illness or cure it.