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Joy is a deep, abiding, internal sense of satisfaction, even when all conditions are not perfect, and life at times is out of our control. Unlike happiness, which is based on happenstances(or what happens around us), joy should remain during the tough times of life.

We can be sad about a situation/circumstance, but still maintain that deep sense of joy. To grow in wisdom is to realize that while circumstances can impact our happiness, our true internal joy is not impacted. To be a wise person we need to understand that sometimes life is rough and not everything turns out how we envisioned it.