Who taught you to reason that because God was good you could sin with impunity? Such is not the teaching of the Holy Spirit. On the contrary, those who listen to His voice reason thus: God is good; therefore, I must serve Him, obey Him, and love Him above all things. God is good; therefore, I will turn to Him with all my heart; I will hope for pardon, notwithstanding the number and enormity of my sins. God is good; therefore, I must be good if I would imitate Him. God is good; therefore, it would be base ingratitude in me to offend Him by sin.
Thus, the greater you represent God's goodness the more heinous are your crimes against Him. Nor will these offenses remain unpunished, for God's justice, which protects His mercy, cannot permit your sinful abuse of it to remain unavenged.
--Louis de Granada,
The Sinner's Guide