Why is the statement 'that's not fair' problematic for Christians?

The phrase 'that's not fair' can become a stumbling block in the Christian life, as it reveals a heart that is focused on perceived justice rather than God's grace. When we recognize that we, as sinners, deserve nothing but judgment, the idea of fairness diminishes, especially in light of God's gracious gifts. As the sermon points out, it is often uttered by those who feel entitled, disregarding that God's grace is fundamentally unmerited. Instead of fostering an attitude of gratitude and appreciation for God's blessings in our lives, focusing on fairness can lead to jealousy and strife. Colossians 3:2 instructs believers to set their minds on things above, urging us to view God's unmerited favor through the lens of grace rather than entitlement.