Tattvabodha, a traditional Advaita Vedanta primer attributed to Adi Shankaracharya, outlines four qualifications for inquiry into the Self: viveka (discernment between the lasting and the transient), vairagya (non-attachment to transient pleasures), shatsampatti (six disciplines such as sense-restraint and mental steadiness), and mumukshutva (a sincere desire for liberation). The text presents these as preparation for inquiry into Atman and Brahman, not as a measure for judging other people. Source: Spiritual Books.