The right kind of sorrow is often needful and brings with it certain benefits. Yet, it is in the joy of the LORD that God's people specifically find strength.
God looks for opportunities to show Himself strong in the lives of His saints. This is true both historically and in the lives of His people living today.
Perceived strength can be one’s own worst enemy. After all, it leads people to think that they are more powerful and capable than they really are.