The excessive laughter causes the heart death
The Messenger of Allah, may the peace and blessings of Allah be upon him, said:
Do not laugh too much, for the excessive laughter causes the heart death (morally).
This proves true by the experience. No one laughs too much except the one who is intellectually obsessed and morally corrupted. His heart suffers, and he fails to free his heart from the pain, grief, darkness, and silliness. He is like a slaughtered bird which dances because of the pain intensity.
If those who are arrogant and self boasting know the reality of this and the torment awaiting for them, they would laugh but a little.
The Messenger of Allah, may the peace and blessings of Allah be upon him, did not say that the mere laugh causes the heart death. But he said: " the excessive laughter causes the heart death"
It is necessary for a person to amuse himself but without extravagance, in the proper places, times and situations.
The wise one knows when to laugh, and when to stop laughing.