-----Here is a quote from Edwards' last sermon to his congregation in Northhampton (who were running him off!).
"This the Scripture has told us, that there are but few saved: and we have abundant confirmation of it from what we see." Jonathan Edwards on Heaven and Hell, 47
In his sermon on "Hypocrites Deficient in the Duty of Prayer" Edwards says rather plainly, "True conversion is a rare thing."
Keep in mind this is a man who saw powerful movements of God! Again, this is another thing you don't hear very often!
UPDATE: A brother wrote and cited what follows in the quote from Edwards sermon on prayer. It's worth adding to the quote above.
True conversion is a rare thing. But that men are brought off from a false hope of conversion — after they are once settled and established in it, and have continued in it for some time, is much more rare.