Sri Aurobindo
Letters of Sri Aurobindo
02. Synthetic Method and Integral Yoga
Prayer and meditation count for so much in yoga. But the prayer must well up from the heart on a crest of emotion or aspiration, the Japa or meditation come in a live push carrying the joy or the light of the thing in it. If done mechanically and merely as a thing that ought to be done (stern grim duty!), it must tend towards want of interest and dryness and so be ineffective.... You were doing Japa too much as a means for bringing about a 
result, I meant too much as a device, a process laid down for getting the thing done. That was why I wanted the psychological conditions in you to develop, the psychic, the mental, for when the psychic is forward, there is no lack of life and joy in the prayer, the aspiration, the seeking, no difficulty in having the constant stream of bhakti and when the mind is quiet and inturned and upturned there is no difficulty or want of interest in meditation. Meditation, by the way, is a process leading towards knowledge and through knowledge, it is a thing of the head and not of the heart, so if you want dhyāna, you can’t have an aversion to knowledge. Concentration in the heart is not meditation, it is a call on the Divine, on the Beloved. This yoga too is not a yoga of knowledge alone, knowledge is one of its means, but its base being self-offering, surrender, bhakti, it is based in the heart and nothing can be eventually done without this base. There are plenty of people here who do or have done Japa and base themselves on bhakti, very few comparatively who have done the “head” meditation; love and bhakti and works are usually the base; how many can proceed by knowledge? Only the few.