John Owen once said that as men rise in their notions about the seriousness of sin so they rise in their understanding of the grace of Jesus. To that end, magnifying the grace of Jesus, I offer the following thoughts on the seriousness of sin.
Sin must be awful because:
It is an offence against God. "Against Thee and Thee only have I sinned..." Ps.51:4
God doesn't want us to sin. "My little children I am writing these things to you that you may not sin." 1 John 2:1
Sin makes God angry. "Do homage to the Son, lest He become angry and you perish in the way for His wrath may be soon kindled." Ps. 2:12
Sin made God sorry that He made man. "And the Lord was sorry that he had made man on the earth and He was grieved in His heart." Genesis 6:6
God punishes sin in an extreme way therefore sin must be extremely awful. "But the present heavens and earth are being reserved by His Word for fire, kept for the day of judgment and destruction of ungodly men." 2 Peter 3:7
God killed His Son because of our sin. "But the Lord was pleased to crush Him, putting Him to grief; if He would render Him as a guilt offering." Is. 53:10
God's Son suffered because of our sin. "For since He Himself was tempted in that which He has suffered, He is able to come ot the aid of those who are tempted." Hebrews 2:17,18
Godly men hate sin. "Beloved I urge you as aliens and strangers to abstain from fleshly lusts which wage war against the soul." 1 Peter 2:11
Godly men mourn over sin. "My eyes shred streams of water, because they do not keep Thy law." Ps. 119:136
Godly men would rather suffer than sin. "By faith Moses...choosing rather to endure ill-treatment with the people of GOd, than to enjoy the passing pleasures of sin." Hebrews 11:24,25
Sin is contrary to the nature of God. "But like the Holy One who called you, be holy in all that you do." 1 Peter 1:15
Sin is contrary to the works of God. "The one who practices sin is of the devil; for the devil has sinned from the beginning. The Son of God appeared for this purpose, that He might destroy the works of the devil." 1 John 3:8
Sin is contrary to the people of God. "For the flesh sets its desire against the Spirit, and the Spirit against the flesh; for these are in opposition to one another, so that you may not do the things you please." Galatians 5:17
Sin carries awful consequences. It is bad for your body, bad for your soul, bad for your conscience, bad for your joy, bad for your well-being, bad for your marriage, bad for your families, bad for your future and bad for your mind.
(Many of these thoughts and ideas came from Ralph Venning's book The Plague of Plagues . Why don't you try to think of some more."