Liberation is giving up of the unreal. Let us suppose you want a cup of fruit juice. Unless you throw away the water already in the cup, you cannot pour the juice in the cup. Similarly, unless you give up materialism, Atma bhava (spiritual attitude) cannot come to you. Moksha (Liberation) is not a distinct and different spiritual discipline. It is only giving up unnecessary desires. Ignorance is the cause of jealousy, and jealousy is the cause of disharmony. And disharmony is the cause of anger. Through anger, wisdom is lost. The real spiritual wisdom is seeing "One in All" at all times. If there is duality or differences, wisdom declines.
Sri Sathya Sai Baba, Divine Discourse, Sep 21, 1980