7 So then neither is he that planteth any thing, neither he that watereth; but God that giveth the increase.
8 Now he that planteth and he that watereth are one: and every man shall receive his own reward according to his own labour.
9 For we are labourers together with God: ye are God's husbandry, ye are God's building.
10 According to the grace of God which is given unto me, as a wise masterbuilder, I have laid the foundation, and another buildeth thereon. But let every man take heed how he buildeth thereupon.
11 For other foundation can no man lay than that is laid, which is Jesus Christ.
12 Now if any man build upon this foundation gold, silver, precious stones, wood, hay, stubble;
He’s talking about the preachers and teachers within the church. It’s those who are the leaders of the church that build the church and each one of those leaders work will be tried whether they fed the people in the church with milk (weak teaching for new Christians) or meat (deeper teaching and understanding) for those who are growing stong in the faith.
If they are fed meat intended to grow strong Christians in the faith the “work” they did will last. If they have only fed milk and the Christians are still babes and weak in the faith they will fail or fall away when tried.
No, because he says "every man's". I already answered to that.
Besides, is it your opinion then that the clergy goes through purgatory but no one else?