And, of all kinds of pride, spiritual pride is upon many accounts the most hateful, it is most like the devil; most like the sin he committed in a heaven of light and glory, where he was exalted high in divine knowledge, honour, beauty, and happiness. Pride is much more difficult to be discerned than any other corruption, because its nature very much consists in a person’s having too high a thought of himself. No wonder that he who has too high a thought of himself, does not know it; for he necessarily thinks that the opinion of himself was without just grounds, he would therein cease to have it. Those that are spiritually proud, have a high conceit of these two things, viz. Their light, and their humility, both which are a strong prejudice against a discovery of their pride. Being proud of their light, that makes them not jealous of themselves; he who thinks a clear light shines around him, is not suspicious of an enemy lurking near him unseen; and then, being proud of their humility, that makes them least of all jealous of themselves in that particular, viz., as being under the prevalence of pride. There are many sins of the heart that are very secret in their nature, and difficultly discerned. The psalmist says, Psal. xix. 12. “Who can understand his errors,? Cleanse thou me from secret faults.” But spiritual pride is the most secret of all sins. The heart is deceitful and unsearchable in nothing so much as in this matter; and there is no sin in the world, that men are so confident in. The very nature of it is to work self-confidence, and drive away jealousy of any evil of that kind. There is no sin so much like the devil as this for secrecy and subtlety, and appearing in a great many shapes undiscerned and unsuspected. It appears as an angel of light; takes occasion to arise from every thing; it perverts and abuses every thing, and even the exercises of real grace, and real humility, as an occasion to exert itself: it is a sin that has, as it were, many lives; if you kill it, it will live still; if you mortify and suppress it in one shape, it rises in another; if you think it is all gone, yet it is there still. There are a great many kinds of it, that lie in different forms and shapes, one under another, and encompass the heart like the coats of an onion; if you pull off one, there is another underneath. We had need therefore to have the greatest watch imaginable over our hearts with respect to this matter, and to cry most earnestly to the great searcher of hearts for his help. He that trusts his own heart is a fool.