we all know the story of how Shiva volunteered to receive Ganga on His head when she had to descend to earth from the heavens for the upliftment of humanity, both living, and the dead. But, she was so full of Divinity that the very earth she was coming to purify would not have been able to take the impact of the torrential ‘weight’
of her Gyana! Shiva stepped forward to make His own matlocks a landing pad for her, Shiva’s Yogic hair already contained the ultimate Gyana,infinite Divinity within, and could receive an infinite amount more.
This reminds us of the Purna prayer from the teachings of the ancient hindu rishis, in the Isha Upanishad, which is the first Upanishad.

Om Puurnnam-Adah Puurnnam-Idam Puurnnaat-Puurnnam-Udacyate |Puurnnasya Puurnnam-Aadaaya Puurnnam-Eva-Avashissyate || Meaning:
Fullness ‘that’ (Outer World) Fullness ‘this’ (Inner World) From Purna is manifested Purna (From the Fullness of Divine Consciousness within, the outside world is mani- fested), Even after manifesting a whole Purna from itself, Purna still remains the same.
Shaivites believe that Shiva is the Adi Purnam, the Original Fullness, therefore no amount of giving or receiving Gyana will affect His own Fullness in any way.
And this makes it easier to understand why Shiva has a nature of taking every cosmic event upon His own head, be it the Samundra manthan or then, the reception of Ganga.
Aum Namah Shivaye
is a Jammu based Shaivite author)