In one part of his lecture, professor Hussein Ansarian said: monotheism means to believe in oneness of the God Almighty, namely, I accept no one for worship and obedience but one person who is the lord of the universe; in fact, I have wholeheartedly rejected all other gods and I have chosen the right God, I obey him and I worship him, I live with him and I stay with him.
source : erfan.ir