Scott Hafemann, The God of Promise and the Life of Faith, Crossway Books, 2001, p. 32.
Indeed, the existence of fellowship within the Trinity (John 17:23-24) makes it evident that the creation of mankind was not intended to meet some deficiency in God. God was not lonely, bored, or incomplete before he created humanity. God is perfect in Himself, happy in the fellowship and love that exist from all eternity between the Father, Son, and Spirit. Thus, rather than being an attempt to make up for a lack within the Trinity, God created mankind simply because he delights in sharing Himself as an expression of his overflowing self-sufficiency.
Scott Hafemann, The God of Promise and the Life of Faith, Crossway Books, 2001, p. 32.