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. Let the mind be cheerful, but calm. This world is a mere appearance. Mind and the senses are deceiving you every moment.