If I love my spouse, why do I find it so easy to treat them like I don't? We can be harsh, critical, inconsiderate, frustrated, unappreciative and so much more in a host of situations. We aren't immune from these sins or situations simply because we are Christians.
PAUL'S CONFESSION AND OURS
In 1 Timothy 1:15 Paul states that Christ came to save sinners of whom he [Paul] is the foremost. Paul is not comparing himself to others but talking about what goes on in his own heart. He sees more of his own sin on a daily basis than anyone else's sin. He's the biggest sinner he knows. Paul then goes on to say that Jesus Christ displayed His perfect patience to the foremost of sinners as an example of the kind of saving that Jesus can do. In light of God's holiness, Paul was aware of his sin. He likewise was aware of God's mercy when contrasted against his sin.
THE BIBLICAL REALITY OF JOYFUL WRETCHES
A great awareness of our sin leads us to exult in God (1 Timothy 1:17). To think that our sin is small results in loving others less (Luke 7:47). We must see our sin a vastly disgusting, so that grace is amazing, so that may love God and others correctly. Until sin be bitter, marriage may not be sweet.
ROB, SALLY, AND THE REST OF US
If our fights are not grounded in this reality, the proper solutions will escape up. Our sin pitted up against God's grace enables us to overlook sin, to correct our spouse graciously and to be patient when repentance doesn't come about as quickly as we'd like. Understanding that we are sinners that are being saved from the desire to sin, we can know that God is using us to help our spouse to become more like Christ. Understanding our sin nature and God's purpose in saving us will also make it easier to receive correction from our spouse when we are in sin. Secular psychology does not have the answers to our dilemma and helps us to justify our sin (birth order, temperament, addiction, dysfunctional families, etc,) and leaves you in victim status. If you take away the reality of sin, then possibility of repentance is removed and there is no hope of salvation in Christ. When you admit that you're the worst sinner you know, you appreciate God's grace and grant grace to your spouse.
THE WORST THING ABOUT SIN
All sin is, firstly, against God. Our very nature is offensive to God (Romans 3:23, Romans 5:12). Sin is not wrong because of what it does to others, but because it's rebellion against God. Fixing sin isn't just about restoring peace between husband and wife, but about walking in the way God created us to be and saved us for.
WORST OF SINNERS-BEST OF WORLDS!
When we recognize that we are the worst sinners, then we'll be a better spouse. Don't fear being too hard on yourself. Remember that you are in Christ. We are the beloved of God. Christ is at work in us conforming us to His image. A sober assessment of our sin will not hinder God's work it us. Rather, it celebrates the work of God. John Owen wrote, "There are two things that are suited to humble the soul of men, a due consideration of God, and then of ourselves. Of God, in his greatness, glory, holiness, power, majesty, and authority; of ourselves, in our mean, abject, and sinful condition."