No hypocrite under heaven is totally divorced from the love and liking of every known sin. There is still some secret lust or other, which as a sweet morsel he rolls under his tongue, and will not spit it out, Job 20:12–14. Every hypocrite tolerates some evil or other in himself, and takes liberty to transgress. …
Some sin or other always reigns without control in an hypocritical heart. … An hypocrite always reserves one nest-egg or another in his heart or life, for Satan to sit and brood on. Jehu did many brave things, but yet he kept up the worship of his golden calves. Naaman promises high, but yet he is for bowing in the house of Rimmon. The pharisees were very devout, but yet they loved the praises of men, and the upper-most seats in the synagogues.
There is never an hypocrite in the world, but will do what he can to save the life of his sin, though it be with the loss of his soul. O sirs! Satan can be contented that hypocrites should yield to God in many things, provided they will be but true to him in some one thing.
The Complete Works of Thomas Brooks, 3:437–438.