Impossibility is only a sum of greater unrealised possibles. It veils an advanced stage and a yet unaccomplished journey.
The yogin becomes aware in part of the action of the supramental power organizing the lower vehicle (ādhāra). A part of it remains behind the veil and prepares itself.
What men call knowledge, is the reasoned acceptance of false appearances. Wisdom looks behind the veil and sees.
There is a veil between the Supermind above and the lower Prakriti below - the veil of ingrained formations. This veil may completely withdraw or be partially withdrawn. Thus even if there is some little opening, with the contact of Light from above the lower nature will get slowly changed.