The power of the gospel comes in two movements. It first says, “I am more sinful and flawed than I ever dared believe,” but then quickly follows with, “I am more accepted and loved than I ever dared hope.” The former outflanks antinomianism, while the latter staves off legalism. One of the greatest challenges is to be vigilant in both directions at once. Whenever we find ourselves fighting against one of these errors, it is extraordinarily easy to combat it by slipping into the other. Here’s a test: if you think one of these errors is much more dangerous than the other, you are probably partially participating in the one you fear less.
Tim Keller in Center Church, page 48 (Kindle)