Happiness is a matter of high frequency vibration!
Happiness is a matter of high frequency vibration and not of understanding and knowledge.
And a high vibration depends on purity of mind and heart.
The best way to raise the vibration and purify the mind and heart is through Satsang with enlightened beings, mantra repetition, prayer, discrimination between the Self (Consciousness, Being) and non-Self (mind, ego, body) and non-identification with non-Self and meditation.