The Lord is not approachable by everyone because He is curtained by His yogamaya potency. But one should not wrongly conclude that the Lord was formerly unmanifested and has now manifested Himself in the human form. This misconception of the formlessness of the Supreme Personality of Godhead is due to the yogamaya curtain of the Lord and can be removed only by the supreme will, as soon as the conditioned soul surrenders unto Him. (SB 2. 5. 20p)
The reason is that the Lord reserves the right of no

