Charles Spurgeon Commentary John 5:25-30

"Verily, verily, I say unto you, The hour cometh, and now is, when the dead shall hear the voice of the Son of God; and they that hear shall live. For as the Father hath life in himself, even so gave he to the Son also to have life in himself: and he gave him authority to execute judgment, because he is a son of man. Marvel not at this: for the hour cometh, in which all that are in the tombs shall hear his voice, and shall come forth; they that have done good, unto the resurrection of life; and they that have done evil, unto the resurrection of judgment. I can of myself do nothing: as I hear, I judge: and my judgment is righteous; because I seek not mine own will, but the will of him that sent me." — John 5:25-30 (ASV)

Christ as Mediator did the will of the Father, and yet also did his own will, for his will was always the same as his Father's.