From the sermon "The Brotherhood of Christ" found on pages 702-703 in the book Pastor Russell's Sermons (1917):
Our Redeemer's words give the key suggesting the characteristics for which we would seek. He says: "By this shall all men know that ye are My disciples, if ye have love for one another." (John 13:35.) He emphasizes this, saying, "A new commandment I give unto you, that ye love one another as I have loved you." (John 13:34.) Ah, we get the thought that the Church is a blessed brotherhood of all those who not only love God supremely, so that they delight to do His will, even at the cost of self-interest, but who also love one another as Christ loved them, which signifies to the extent of willingness to lay down their lives for one another! We look in vain for such an organization amongst men. We perceive various bundles or organizations under various names, all professing love, but none of them even dreaming of such bonds of love. We are not forgetting the Masons, the Odd Fellows, the Presbyterians, the Methodists, the Episcopalians, the Lutherans, the Roman Catholics, etc. But none of these claim to be such a brotherhood as our Lord has described. They do indeed claim to give special attention to each other's interests, and to have certain reverence for God, but not to the extent that our Master intimated---not to the extent of laying down their lives in doing the will of the Father and in their love for the brethren.