In context, ‘men’ here are unbelieving men and women, members of an unbelieving world which is in darkness and opposed to God. It is the will of God that they see the light that God has sent into the world.
For our part, we are to focus on the love we have for the Father and the obedience that flows from it. We are to be careful to forget about any praise that we may receive and give all credit, even for our own good works, to God. It is he that has pardoned our sins and released us from the consequences of them. It is he that has taught us what is good. It is he that has created a new nature within us that desires to please him, and it is he that has given us opportunity to do good. We cast our crowns before him. But this does not mean that we hide our good works from the sight of an onlooking world. We do not cover over the fact that we are Christians, for we would be covering over, not something that we have made but which God has made, and who are we to cover over his workmanship? It is the will of the Father that his children are seen, and that their good works are the means of bringing others into the kingdom. They are not to hide their good works, either from fear of persecution, or from false modesty, but they are to be what God has made them: lights in a world that is away from God.
How can the disciples who are addressed here by the Lord fail to notice this reference to God: your Father which is in heaven? This language can only be used of true believers who have entered into the kingdom and now belong to God. In such few words Christ describes such immense privileges. To have God as our Father is to have all power on our side, to have all things working for our good, to have the certainty that we can never be lost. How can the perfect Father lose one of his children? If God is our Father, he has a father’s heart of love. He leads us into life everlasting. To have a father on earth is to have a mortal father, but to have a Father in heaven is to have an immortal Father, a Father forever.