Four-fold qualifications required for an Advaitin
Sādhana Chathushtaya :
Any mumukshu (one seeking moksha) has to have the following four sampattis (qualifications), collectively called Sādhana Chathushtaya Sampatti (the four-fold qualifications):
Nityānitya vastu viveka — The ability (viveka) to correctly discriminate between the real (nitya) substance (Brahman) and the substance that is unreal (anitya).
Ihāmutrārtha phala bhoga vyrāgya — The renunciation (virāga) of enjoyments of objects (artha phala bhoga) in this world (iha) and the other worlds (amutra) like heaven etc.
Sad sampatti — the six-fold qualities of śama (control of the antahkarana), dama (the control of external sense organs), uparati (the refraining from actions; instead concentating on meditation), titiksha (the tolerating of tāpatraya), śraddha (the faith in Guru and Vedas), samādhāna (the concentrating of the mind on God and Guru).
Mumukshutva — The firm conviction that the nature of the world is misery and the intense longing for moksha (release from the cycle of births and deaths).
It has to be noted that advaita vedānta categorically states that moksha is available only to those possessing the above mentioned four-fold qualifications. Thus any seeker wishing to study advaita vedānta from a teacher must possess these.