The sun of suns is ever shining in you, but your blind eyes cannot behold it. The eternal sound is within you, but your deaf ears cannot hear it.
Be always cheerful, laugh and smile. Try to be happy always.
Keep the mind in a state of moderation. Never let it run to excesses. The mind always runs to either extreme depression or extreme joy. Extremes bring about reaction. The mind can never be calm in excessive joy. Let the mind be cheerful but calm.
Happiness comes from peace of mind. Real happiness is within you. It is in the atman. Happiness is your very nature.