"The terrible thing, the almost impossible thing, is to hand over your whole self - all your wishes and precautions - to Christ. But it is far easier than what we are all trying to do instead. For what we are trying to do is to remain what we call 'ourselves', to keep personal happiness as our great aim in life, and yet at the same time to be 'good'. We are all trying to let mind and heart go their own way - centred on money or pleasure or ambition - and hoping, in spite of this, to behave honestly and chastely and humbly. And that is exactly what Christ warned us you could not do. As He said, a thistle cannot produce figs. If I am a field that contains nothing but grass-seed, I cannot produce wheat. Cutting the grass may keep it short: but I shall still produce grass and no wheat. If I want to produce wheat, the change must go deeper than the surface. I must be ploughed up and re-sown."