The mere self is subject to change and destruction; the real Self is not. The aspirant should understand both and should finally establish himself in his essential nature: Atman. Then he can live in the world without being affected by it. In the domain between the real Self and the mere self lies our antahkarana (internal instrument), which plays a most important part in both our internal and external life. If not understood, both goals of lifeliving in the world and Self-realizationare defeated. Our psychological life needs profound and deep study if we are to free ourselves from the quagmire of emotionality, egotistical preoccupations, and self-delusion and if we are to realize our fullest potentials for the unfoldment of consciousness. That which needs detailed analysis, understanding, and unfoldment is the mental life, which is vast in its characteristics. The outside world can be mastered only when the inner potentials are systematically explored and organized. Without understanding one's inner potentials, it is not possible to function effectively and harmoniously in the external world, for all things happen within before they are expressed externally.