Srimad Bhagavadgita Sadhaka Sanjivani -Swami Ramsukhdas
It proves, that the Lord and saints, shower their grace, even on unqualified and undeserving persons, but qualified and deserving persons, know the reality about Him, in the same way, as a mother loves her innocent child more than she loves a grown up son, while the grown up son knows her and her loving nature more than an innocent child. The Lord, loved the simple and innocent cowherds, cowherdesses and cows, more than He loved the liberated souls, though the latter knew His tree self. Similarly, Saiijaya deserved to have a vision of the Lord's cosmic form, and so he could behold, it without requesting the Lord, while the Lord Himself had to arouse curiosity in Arjuna, and revealed to him this cosmic form, as Arjuna regarded the Lord as his friend, not as the Lord. So the Lord, was more gracious to Arjuna and it was by His grace, that Arjunas delusion was destroyed (Gita 18/73). It proves, that the Lord by His grace, destroys the delusion, of His devotees.