How does one know if his soul is happy?

First of all, one has to know and feel where the soul abides, its location in the body. In order to know and feel the soul, one has to aspire. During one's ardent aspiration, one's spiritual journey, one can actually discover whether the soul is happy or not. He will feel that his soul is happy only when he sees and feels joy within and without, and also when he does not find fault with God's creation and God's divine dispensation.