The evidence for the Trinity is throughout the bible. Here is another example:
John 16:32, Jesus said, “Behold, the hour is coming, indeed it has come, when you will be scattered, each to his own home, and will leave me alone. Yet I am not alone, for the Father is with me.”
A common argument against the Trinity is that God is only person; God is alone. Jesus declares just the opposite. Jesus is not alone. The Father is with him. Think with me, if God is only one person who manifests himself in different forms (as Father, later as Son, and still later as Spirit) then we must affirm that God is alone. If that is true, then Jesus was wrong. The Father is not with him, Jesus is left alone, he has only himself.
Praise God for the Trinity; three in One. We see the great blessing of the Trinity in their perfection relationship of love and joy. When every other person had abandoned the Son, he took heart. He was not alone. There was another person with him. The Father is not always the Son. No, the Bible affirms the Father is always with the Son.