The link of life binds each believer to our risen Lord. Were there but one Christian in all the world, the precious truths of a full and eternal salvation would be his.
The link of individual communion also holds each believer walking humbly, in practical fellowship with "the Father, and His Son Jesus Christ." Did all but one grow cold and worldly, the sweet privilege of walking and talking with God would still be his in all its fullness, though of course there would be sadness because of the state of the rest.
But when we speak of the Church we do not think merely of individuals, but of the whole body of Christ. Individual salvation and individual communion there must be, but the Church brings in thoughts of responsibility as well as of privilege.
These privileges and their accompanying responsibilities are unfolded to us in the Word of God. The Church is the Body of Christ, He the Head. It is indwelt by the Holy Spirit. It is therefore one. By the Spirit we are not only members of Christ, but members of one another. The unity of the Body is to be practically manifested by keeping the unity of the Spirit. The Church is one. But this means one not only in life, but in organism, possession of gifts, testimony, and discipline.
We cannot, if we would, shirk these responsibilities. We cannot go on as individuals, nor even as local assemblies. We are responsible to hold the truth, and seek to exhibit it, of the One Body and the One Spirit. May our God keep us from attempting any other path as seeming more easy.