Well here is the Answer. From Yogananda.
In God talks with Arjuna

I still protest. Not fair. Not right.

The Spirit or Sat – Chit- Ananda(ever existing , ever conscious, ever new Bliss )
is uncontaminated by the darkness of delusion ( Nature) , even as a serpent , the possessor of poison , itself remains unaffected by its own venom.

Though the poison is produced within the snake , the creature is not affected by it ;
Similarly ,even though the delusive dualities of Nature derive from God, He is uninfluenced by them .

When a serpent bites anyone , the victim is affected by the poison ;
Similarly, man as a mortal is afflicted by cosmic delusion .

Nevertheless , though ‘Maya ‘ is imposed on man , he can overcome it by refusing to yield to its temptations .

The devotee should understand that the purpose of God in creating the world and
Delusion is to develop perfect beings. This pastime is God’s hobby !

GTWA. Chapter 5. Verse 15.

Page no 549.