BG 12.4-6
Restraining and subduing the senses, regarding everything equally, in the welfare of all rejoicing, these also come unto Me. The difficulty of those whose minds are set on the Unmanifested is greater; for the path of the Unmanifested is hard for the embodied to reach. Those verily who, renouncing all actions in Me and intent on Me, worship meditating on Me, with whole-hearted yoga,