Asmita is the veil or coloring that sometimes causes one to forget the true limitations and scope of one's identity. This is when one can fall into the trap of having an ego that is too big or powerful. This can lead to conflict in many aspects of life, causing anger and suffering.
Yogis can use their spells of deep meditation to reflect on the true meaning of the self. Over time, this can lead to the veil, known as asmita, eventually being drawn aside and the yoga practitioner finally being able to see a true vision of the universe.