A bruised reed He will not break, and smoking flax He will not quench…
– Matthew 12:20

I know there are some very strong people here-I mean strong in their own ideas. I often meet with persons who would not confess any such weakness as this. They are strong minds. They say, “Do you think that we go into sin, sir? Do you tell us that our hearts are corrupt? We do not believe any such thing; we are good, and pure, and upright; we have strength and might.” To you… I am saying nothing; but take heed-your strength is vanity, your power is a delusion, your might is a lie-for however much you may boast in what you can do, it shall pass away; when you come to the real contest with death, you shall find that you have no strength to grapple with it: when one of these days of strong temptation shall come, it will take hold of you, moral man, and down you will go; and the glorious livery of your morality will be so stained, that though you wash your hands in snow water, and make yourselves never so clean, you shall be so polluted that your own clothes shall abhor you. I think it is a blessed thing to be weak. The weak one is a sacred thing; the Holy Ghost has made him such. Can you say, “No strength have I?” Then this text is for you. ~ C.H. Spurgeon

http://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0006.cfm