“Now thanks be to God who always leads us in triumph in Christ, and through us diffuses the fragrance of His knowledge in every place.” 2 Corinthians 2:14
People in Paul’s day would’ve known about triumphal processions. When a king or some other leader won a notable military victory, the whole city would come out to celebrate him and his troops as they returned home. All kinds of ceremonies and rituals took place to proclaim their victory, and among them was the practice of burning incense. The smell of the incense told the people in the crowds and neighboring streets of what was being celebrated, whether they could see the celebration or not.