Happiness is energy, not thought. Happiness is not a state of mind, but Prana, the primordial bliss-energy of creation.
We won't attain happiness by replacing one thought with another, by imagining, or by manipulating mental states. Neither will we attain happiness by performing "good deeds." Many people perform constant work yet remain unhappy and depressed; even though they are outwardly active, their inner energy is low. People with low prana are not healing to be with.
The energy of happiness, the energy of prana, pours freely hroughout the universe. Wild animals and angels know how to breathe it in. When a creature of the forest is exhausted or sick, it knows how to curl up into a ball of fur, in soft green silence, to recharge with prana. Then it becomes wild and vital again.
But humans ruin this natural process of graceful restoration, by trying to "do" it with their minds.
If we want to receive healing or give healing, we must dive deep into the source of energy, far deeper than mere thinking. The well of prana lies beyond the mind. Tapping that source of bliss-energy, we imbibe pure happiness with every cell of our body. This is the power of meditation. Jai Guru Dev.