Happiness is your very nature. This is termed cheerfulness. This spirit of cheerfulness must be cultivated by all aspirants. Keep the mind in state of moderation or happy, golden mean. Never let it run to excesses.
People die of shock from extreme depression as well as extreme joy.
Do not allow Uddharsha to crop up in the mind. It is excessive merriment. Mind always runs to extremes, either to extreme depression or extreme joy. Extremes bring about reaction. Mind can never be calm in excessive joy.