A man who is a partaker of the love of God will manifest it by certain characteristics.  If he is in the light, as God is in the light, he will walk as a child of light.  A man cannot love God and hate his brother at the same time, for this is utterly contrary to the nature of the God Who is love.  If the love of God is at motion within us, it is simply an utter impossibility that we can look at the sufferings of our brethren with a cold heart.  John rightly poses the question, “He that loveth not his brother whom he hath seen, how can he love God Whom he hath not seen?”  It is easier for us to have the affections of love kindled in our breasts for those whose needs and sufferings we can personally witness, than it is to engender love towards the invisible God.  This does not negate the obligation to love God with our highest and best affections, but it is simply a reflection of our creaturely weakness.  If we love God, then we will love those who are born of God.  Beyond this, we will even love those who are outside, even our enemies, by manifesting compassion for their suffering, and ministering the Gospel of salvation to them, in hopes God will bless it to their ultimate salvation.

All this is according to the commandment of God.  It is not enough that love be the natural response of the believer towards the God that loved us first, since we are so much encompassed with sin and infirmities that sometimes that response is not everything it should be.  Lest we ever be tempted to forget our duties towards our fellow men, and our Christian brethren in particular, we have a commandment from God that, if we love Him, we love our brother also.  He who thinks he can get along fine without taking heed to this commandment is deceived, and still a foreigner to the life of the kingdom of God.