Triguna theory has its roots in the Bhagavad Gita and describes the three qualities or energies (gunas) that make up human personality - sattva (balanced), rajas (passionate), and tamas (dull). These gunas influence mental capacity and determine one's dominant personality type. The theory provides a framework for understanding an individual's psychological makeup and how the interplay of the gunas drives human behavior and tendencies. Studying the triguna theory can help with self-reflection on one's dominant qualities and improve how one deals with subjective problems.