"For no one can lay any foundation other than the one already laid, which is Jesus Christ." (1 Corinthians 3:11)
Paul addresses the Corinthians directly about their immaturity. He could not speak to them as to spiritual people but as to worldly people, as to infants in Christ. He fed them with milk, not solid food, because they were not ready for it. And they are still not ready. The evidence is the factionalism: when there is jealousy and quarrelling among you, are you not worldly? For when one says I follow Paul and another I follow Apollos, are you not merely human? Paul and Apollos are servants through whom you came to believe, nothing more. Paul planted, Apollos watered, but God gave the growth. The one who plants and the one who waters have one purpose, and they will each be rewarded according to their own labour. But God is the one who makes things grow. The Catechism presents this as the theology of ministry: all ministry in the Church is instrumental, directed toward producing growth that only God can give (CCC 875).
Paul shifts the metaphor from agriculture to architecture. By the grace given to him as a wise master builder, he laid the foundation. Someone else is building on it. But each one should build with care. For no one can lay any foundation other than the one already laid, which is Jesus Christ. On that foundation various builders construct with gold, silver, costly stones, or wood, hay, and straw. The Day will reveal the quality of each person's work: it will be tested by fire. Whoever builds on the foundation with quality materials will receive a reward. Whoever builds with inferior materials will suffer loss, though they themselves will be saved, yet as through fire.
The community itself is God's temple, and God's Spirit dwells in the community. Therefore do not destroy God's temple. And do not deceive yourselves about the wisdom of this age: if anyone thinks they are wise by the standards of this age, let them become a fool, so that they may become wise. All things are yours: Paul, Apollos, Cephas, the world, life, death, the present, the future, all are yours, and you are of Christ, and Christ is of God. The fullness of possession is already given; the factionalism is therefore absurd.
Brothers and sisters, what are you building on the foundation of Christ? Wood, hay, and straw look adequate during construction. Only the fire reveals whether the work was real. Build with gold: prayer that costs you something, service that asks nothing in return, charity that is not performance. The Day will reveal it. Build for that Day.
Lord Jesus, you are the only foundation. Let everything we build in ministry, in family, in community, be built with the materials that survive the fire. And deliver us from the factionalism that divides your temple, in which your Spirit dwells. Through Christ our Lord. Amen.