But is it not said in the Commentaries that the term "purification of mind" applies only to access concentration and fully absorbed concentration? That is true; but one has to take this statement in the sense that momentary concentration is included in access concentration. For in the Commentary to the Satipatthana Sutta it is said: "The remaining twelve exercises are subjects of meditation leading only to Access Concentration."  Now, in the case of the subjects dealt with in the sections of the Satipatthana Sutta on postures, clear comprehension and elements, the concentration of one who devotes himself to these exercises will be definitely only momentary concentration. But as the latter is able to suppress the hindrances just as access concentration does,  and since it is the neighbourhood of the noble-path attainment concentration,  therefore that same momentary concentration is spoken of by the name of "access" (or "neighbourhood") and also the meditation subjects that produce that momentary concentration are called "meditation subjects leading to access concentration." Hence it should be understood that momentary concentration, having the capacity to suppress the hindrances, has also the right to the name "access" and "purification of mind." Otherwise purification of mind could not come about in one who has made bare insight his vehicle by employing only insight, without having produced either access concentration or fully absorbed concentration.
As we gain in experience and self-understanding, and as we acquire full appreciation for the nature and quality of our own feelings, we find that the positive feelings (love, compassion, etc.) are satisfying, meaningful, and wholesome experiences in and of themselves. That is, they have their own inherent worth and intrinsic value independent of any world view or religious dogma. Conversely, greed, hatred, lust, etc., are agitating, discomforting experiences (. dukkha) which when present preclude a full realization of the happiness born of love and equanimity. Thus the realization of positive feelings and relinquishment of negative feelings are the major goals and motivations of meditation. While Nibbana and an end of suffering are the primary goals of meditation and the realization of positive feelings is a secondary goal, there are also several tertiary goals which must be achieved before the higher ones can be fully realized. These are non-attachment, insight, and concentration.