HE is the drive behind all

The following excerpt is taken from C.S. Lewis's Mere Christianity.

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"'Niceness – wholesome, integrated personality – is an excellent thing. We must try by every medical, educational, economic, and political means in our power to produce a world where as many people as possible grow up 'nice'; just as we must try to produce a world where all have plenty to eat. But we must not suppose that even if we succeeded in making everyone nice we should have saved their souls. A world of nice people, content in their own niceness, looking no further, turned away from God, would be just as desperately in need of salvation as a miserable world – and might even be more difficult to save."

God is the drive, OUR drive behind any moral goodness. Without Him, what are we supposed to be? What is human nature in its fundamental sense?