All sorts of people are fond of repeating the Christian statement that "God is love." But they seem not to notice that the words 'God is love' have no real meaning unless God contains at least two persons. Love is something that one person has for another person. If God was a single person, then before the world was made, He was not love.
Author: C.S. Lewis Source: Beyond Personality, Macmillan, 1948, p. 21.
It was the whole Trinity, which at the beginning of creation said, "Let us make man". It was the whole Trinity again, which at the beginning of the Gospel seemed to say, "Let us save man".