Why would this statement be here?
To simply say that the Lord is omnipotent?

The Lord does not need to defend, explain or tout Himself. When He speaks it is for our benefit.

The message here connects with the one in Mar 11:24.
The HolySpirit wants us to understand that, as His children, we can do all things through Him who strengthens us. Phi 4:13

Jesus manifested the omnipotence of His HolySpiritFather. He is the FirstFruit and we are His brothers.