A 3rd proof against the trinity doctrine by Jesus (Matthew 20:23, Mark 10)

Matthew 20:23, Jesus, addressing his disciples, namely the two children of Zebedee, says, "To sit at my right hand and at my left is not mine to give, but it shall be given to them, for whom it is prepared of my Father." The reader will find the same idea expressed in Mark 10. Now if the Son is less powerful than the Father, how can it be asserted that the Father and Son are all one?

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