Man, take him as he comes into the world, and he is not only a dead man, and a fool, but a proud man also. Pride is one of those sins that first showeth itself to children, yea, and it grows up with them, and mixeth itself with all they do: but it lies most hid, most deep in man as to his soul-concerns. For the nature of sin, as sin, is not only to be vile, but to hide its vileness from the soul. Hence many think they do well when they sin. Jonah thought he did well to be angry with God (Jonah 4:9). The Pharisees thought they did well when they said, Christ had a devil (John 8:48). And Paul thought verily, that he ought to do many things against, or contrary to, the name of Jesus; which he also did with great madness (Acts 26:9, 10). And thus sin puffs up men with pride, and a conceit of themselves, that they are a thousand times better than they are. Hence they think they are the children of God, when they are the children of the devil; and that they are something as to Christianity, when they neither are such, nor know what it is that they must have to make them such (John 8:41-44; Gal 6:3).
Now, whence flows this but from pride, and a self-conceit of themselves, and that their state is good for another world, when they are yet in their sins, and under the curse of God? Yea, and this pride is so strong and high, and yet so hid in them, that all the ministers in the world cannot persuade them that this is pride, not grace, in which they are so confident. Hence they slight all reproofs, rebukes, threatenings, or admonitions that are pressed upon them, to prevail with them to take heed, that they be not herein deceived. 'Hear ye, ' saith the prophet, 'and give ear: be not proud, for the Lord hath spoken.' 'But if ye will not hear it, my soul shall weep in secret places for your pride' (Jer 13:15-17). And what was the conclusion? Why, all the proud men stood out still, and maintained their resistance of God and his holy prophet (Jer 43:2).
Nor is there any thing that will prevail with these to the saving of their souls, until their hearts are broken. David, after he had defiled Bathsheba, and slain her husband, yet boasted himself in his justice and holiness, and would by all means have the man put to death that had but taken the poor man's lamb, when, alas! poor soul, himself was the great transgressor. But would he believe it? No, no; he stood upon the vindicating of himself to be a just doer; nor would he be made to fall until Nathan, by authority from God, did tell him that he was the man whom himself had condemned; 'Thou art the man, ' said he: at which word his conscience was awakened, his heart wounded, and so his soul made to fall under the burden of his guilt, at the feet of the God of heaven for mercy (2 Sam 12:1-13).
Ah! pride, pride! thou art that which holds many a man in the chains of his sins; thou art it, thou cursed self-conceit, and keepest them from believing that their state is damnable. 'The wicked, through the pride of his countenance, will not seek after God' (Psa 10:4). And if there is so much in the pride of his countenance, what is there, think you, in the pride of his heart? Therefore Job says it is to hide pride from man, and so to save his soul from hell, that God chasteneth him with pain upon his bed, until the multitude of his bones stick out, and until his life draws nigh to the destroyer (Job 33:17-22).
It is a hard thing to take a man off his pride, and make him, instead of trusting in, and boasting of his goodness, wisdom, honesty, and the like, to see himself a sinner, a fool, yea, a man that is cruel, as to his own immortal soul. Pride of heart has a power in it, and is therefore compared to an iron sinew, and an iron chain, by which they are made stout, and with which they are held in that stoutness, to oppose the Lord, and drive his Word from their hearts (Lev 26:19; Psa 73:6).
This was the sin of devils, and it is the sin of man, and the sin, I say, from which no man can be delivered until his heart is broken; and then his pride is spoiled, then he will be glad to yield. If a man be proud of his strength or manhood, a broken leg will maul him; and if a man be proud of his goodness, a broken heart will maul him; because, as has been said, a broken heart comes by the discovery and charge of sin, by the power of God upon the conscience.
From John Bunyan's The Acceptable Sacrifice