Paul uses the imagery of armor to convey the importance of spiritual readiness and protection. By saying "we belong to the day," he contrasts the life of a believer with those who live in spiritual darkness. Living in the light means being aware, alert, and self-controlled. The breastplate of faith and love suggests that these virtues protect our hearts, keeping us steadfast in our relationship with God and others. Faith is trust in God, and love is the expression of that trust through our actions.
The helmet of the hope of salvation signifies the protection of our minds. Hope is not just wishful thinking; it is a confident expectation of God's promises, particularly the promise of salvation. This hope guards our thoughts and gives us assurance, even in difficult times. Together, faith, love, and hope form a comprehensive defense against spiritual challenges, enabling believers to live in a way that honors their identity as children of the light. This passage encourages Christians to be vigilant and to equip themselves with these spiritual virtues as they navigate the world.