Then there is the argument which says that surely God’s love is enough. The argument is put like this. It says, ‘We forgive one another without any substitution and without any punishment, and if we, in our love for one another, can do that, surely God, whose love is still greater, should be able to do it with still greater ease.’ To which, of course, the reply is this: If God were only love there might be some force in that argument, but God is light, and God is holy, and God is just, and God is righteous. Not only that; there is no greater fallacy than the argument that goes from men to God. It is a very common error today. People are constantly arguing like that – if this is true of us, they say, how much more so of God? As if God were in series with us! The truth is, of course, that we are in sin and all our ideas are wrong; our conception of love is more wrong than anything else and if we begin to think of God’s love in terms of what we do and what we think, then – I say it with reverence – God help us! If we are going to attribute our sentimental, loose, unjust and unrighteous notions of love to the everlasting Godhead, then we place ourselves in the most precarious position.
Martyn Lloyd-Jones, from his book, God the Father, God the Son