In vedanta there are only two kinds of moods - joy, exultation or exhilaration and grief or depression. Now there is joy and five minutes later there is depression - the currents alternate. They belong to the shad-urmis (six waves, i.e. grief, delusion, hunger, thirst, decay and death). People of gloomy moods attract gloomy thoughts from others and from the akashic (etheric) records in the psychic ether. Persons with hope, cheerfulness and confidence attract similar thoughts from others - they are always successful in their attempts. People with negative moods of depression, anger and hatred do positive harm to others - and great damage in the thought world.
Try to eradicate depression through prayer, meditation, counter-thoughts of joy, chanting Om, self-enquiry and singing divine songs. There are various causes for depression - cloudy day, associating with evil persons, indigestion, influence of astral spirits and revival of old impressions of depression. When you get into a talking mood - practise mouna (silence) at once. When you are in a mood of hatred, develop the opposite virtue, love, and the mood will pass quickly. When you feel selfishness arise, do selfless work. When you are in the mood of separateness, mix with others - through service, love, kindness and forgiveness. If you feel lazy, do some active work.
A liberated being is free from all moods - he has become their master. In Atman (self) there are no moods, there is only pure consciousness. Identify with Atman and you will easily destroy all moods. However, there is one good mood - the meditative mood. When this manifests, immediately give up reading, writing, talking etc., and begin to meditate. Watch for this kind of mood - when meditation comes by itself, without effort.
Laugh and smile. How can a mind that is dull and gloomy think of God? Try to be happy always. Happiness is your very nature. The spirit of cheerfulness must be cultivated by all aspirants.
With the growth of the mind, the pains will increase. But with its extinction there will be great bliss. Having mastery over the mind, free yourself from the world of perceptions in order that you may be of the nature of jnana or wisdom. Though surrounded by pleasurable or painful objects which disturb the equilibrium of your mind, remain rock-like, and receive all things with equanimity.