The fact is we are meant to be happy.
By nature you are happy, by nature your being is perfect, by nature you are in peace, by nature you have a love for life and for all beings.
You just have it, you didn't cultivate it, and so as you awaken more to your own reality, you are discovering something universal.
It is like you are knowing without study.
When you study you use your mind, but when you find harmony, you are in your heart.