'Myself' in the Bible

At that time I said to you, I am not able to undertake the care of you by myself;

How is it possible for me by myself to be responsible for you, and undertake the weight of all your troubles and your arguments?

See now, I myself am he; there is no other god but me: giver of death and life, wounding and making well: and no one has power to make you free from my hand.