From Greek baptizien:
To affect thoroughly for purification, to renew or establish a
relationship with God.
Implication:
Jesus was baptised on the cross at Calgary because He was thouroughly affected by 'the payment of the ransom held by
Satan for humanities sin' and His love was purified (void of hate), and humanity could now renew or establish a
relationship with Him; God; our Father; our Creator.
"And I myself did not know him, but
the one who sent me to baptize with
water told me, ‘The man on whom you see the Spirit come down and remain is
the one who will baptize with the Holy Spirit.’"
John 1:33 NIV