SB 1.10 - The Lord's form can be experienced by bhakti alone
The ladies said that the Supreme Lord’s form is experienced by great devotees who are completely cleansed of material consciousness by dint of rigid devotional service and full control of life and the senses. That is the only way to purify one’s existence. The Lord can be known only by pure devotional service. If one controls the life air, one can control the senses. Then by intelligence purified by bhakti one can see the form of the Lord. One cannot artificially suppress the active senses but by giving them better engagement, one can bring them under control. Devotional service necessitates engaging the senses in the service of the Lord. Anything done in the service of the Lord becomes at once purified of its material nature. The material conception is due to ignorance only. There is nothing beyond Vāsudeva, whose conception gradually develops in the heart of the learned soul. By the grace of the Lord, all factual knowledge becomes revealed in the heart of a devotee due to dictation by the Lord from within. It is He and not yoga or other processes who can purify completely the intelligence. This implies that the sages ability to conquer the senses and life air is accomplished by bhakti alone, not by prāṇāyama or other processes.