Satan's lie: "God's mercy is a reason to sin."

“When Satan attempts to draw you to sin by presenting God as a God all made up of mercy, then reply that though God’s general mercy extend[s] to all the works of His hand, yet His special mercy is conformed to the ones who are divinely qualified, to the ones who love Him and keep His commandments, to the ones who trust in Him, whose hope hang upon Him and fear Him.” Thomas Brooks, Precious Remedies Against Satan’s Devices