Don't read too much into this. The context is about Jesus giving life to us. This simply says that he's a source of life for humanity. It's probably an anachronism to read it as saying something about Trinitarian theology.John 5:26 NASB "For just as the Father has life in Himself, even so He gave to the Son also to have life in Himself;
This passage, on the other hand
John 10:17 NASB "For this reason the Father loves Me, because I lay down My life so that I may take it again.
does seem to say that Jesus had the power to resume life after being killed. It's important to look at 10:18 as well. He does that at the Father's command, not on his own. It's certainly conceivable that John thought the Father's power was involved as well. Creation happened at God's command...
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