John 5:26
“For as the Father has life in Himself, so has He given to the Son to have life in Himself.”
3. Do you see that this declares a perfect likeness save in one point, which is the One being a Father, and the Other a Son? For the expression “has given,” merely introduces this distinction, but declares that all the rest is equal and exactly alike. Whence it is clear that the Son does all things with as much authority and power as the Father, and that He is not empowered from some other source, for He “has life” so as the Father has. And on this account, what comes after is straightway added, that from this we may understand the other also. What is this then? It is,
Source: Homilies on the Gospel of John (New Advent)