"...a time to weep and a time to laugh ..."

"To every thing there is a season, and a time to every purpose ..."  (Ecclesiastes 3:1)

Jesus wept ...

Of course, that verse in the Bible was surrounded by a description of something that certainly was not a laughing matter.  Yes, there is a time to weep and a time to laugh.

God actually has gifted us with emotions, and a mind to be able to discern the 'times' when each emotion is appropriate and useful. And emotions are primarily meant to be shared, and useful to others also. 

It is not considered appropriate to laugh as someone else is crying at a funeral. Instead, we reach out to that person, and in a way share their feelings ...or at least, show them that we care.

So, why does it say, in the Book of Jeremiah, Chapter 17, that "...the heart is deceitful above all things, and desperately wicked: who can know it?"??

There appears to be a set of emotions that we ourselves express, or keep inside ...though, in either case, we own them.  And there is a set of emotions that is not for ourselves that we have for others ...called empathy and compassion. Ultimately, it is best if we allow God to be within our lives, as He develops within us a growing number of learned emotions ...if we invite Him to be in charge of the 'control center' of our emotions.

In absolute contrast, absorbed in wickedness, one seems to somehow exist beyond that capability ...even beyond crying selfishly, not saying that crying for your present sad condition is selfish, but the kind of selfishness that is thoroughly unsatisfied until it's more fully achieved or when certain advantages over others bring the only truly satisfying emotions.