At the cross and resurrection Jesus was not alone; God the Spirit was with him. For "through the eternal Spirit he offered himself up as a sacrifice to God." and by the Spirit was made alive. As man Jesus Christ offered himself in holiness to God through the power of the Spirit. In other words, the Spirit helped Jesus in the sacrifice. Humanly, he was supported in his decision to go to the cross by the Spirit. The same is true of his resurrection and ascension. In 1 Peter 3:18 we are told that Jesus was "put to death in the body but made alive by the Spirit." And in his ascension he gave the Spirit, so that now Jesus Christ ministers to us still -by the Spirit.
Read Hebrews 9:11-14