"God is faithful, by whom you were called into the fellowship of His Son, Jesus Christ our Lord."
"Fellowship" is "Koinonia" in the Greek. It is also rendered "Communion". The word is used of the Lord's Table, where we literally take communion together, but also of our ongoing connection together with Christ and one another. It means to participate in together, to share together. The idea is not that you get a piece of pie, and I get a piece of pie, but that we all jointly share and experience the pie. We don't divide it up, we each get a spoon and in an orderly manner dig in :-).
Our walk with Christ is not apart from Him, but with Him. He is joined to us and we to Him. We are a part of the Body of Christ, in the Church together. We function and supply to each other from the life of God coursing through us all. The words we often hear are "covenant relationship". We have a relationship with our car in that we use it as a vehicle, but we have communion with each other in that we serve each other. The call to live in common union together is not optional, but part of being in Christ. If we are in Christ, then we are with all others who are in Christ.
Many people fret over their individual "calling", while perhaps missing the larger picture: God has called us into a communion of the saints in Him. Perhaps, we will better discern our individual destinies once we recognize, cherish, and nurture the primary call of God in our lives to walk in fellowship together. If we all share a common life in Christ, and act like it, then our hearts and minds will think along the same lines for we will be living for the same cause.
"I thank my God always concerning you for the grace of God which was given to you by Christ Jesus, (5) that you were enriched in everything by Him in all utterance and all knowledge, (6) even as the testimony of Christ was confirmed in you, (7) so that you come short in no gift, eagerly waiting for the revelation of our Lord Jesus Christ, (8) who will also confirm you to the end, that you may be blameless in the day of our Lord Jesus Christ. (9) God is faithful, by whom you were called into the fellowship of His Son, Jesus Christ our Lord. (10) Now I plead with you, brethren, by the name of our Lord Jesus Christ, that you all speak the same thing, and that there be no divisions among you, but that you be perfectly joined together in the same mind and in the same judgment." -1 Co 1:4-10 NKJV