5. But the chief inference Paul draws from the truth that the Church is God's building is the grave responsibility of those who labour for God in this work. As for Paul's own part in the work, the laying of the foundation, he says that was comparatively easy. There was no chance of his making a mistake there. "Other foundation can no man lay than that is laid, which is Jesus Christ." Any teacher who professes to lay another foundation thereby gives up his claim to be a Christian teacher. If any one proceeds to lay another foundation than Christ, it is not a Christian Church he is meaning to build. He who does not proceed upon the facts of Christ's life and death, he whose instruction does not presuppose Christ as its foundation, may be useful for some purposes of life, but not as a builder of the Christian temple. He who teaches morality without ever hinting that apart from Christ it cannot be attained in its highest form may have his use, but not as a Christian teacher. He who uses the Christian pulpit for the propagation of political or socialist ideas may be a sound and useful teacher; but his proper place is the platform or the House of Commons or some such institution, and not the Christian Church. And the question at present, says Paul, is not what other institutions you may profitably found in the world, but how this institution of the Church, already founded, is to be completed. Other _foundation_ no Christian teacher is proposing to lay; but on this foundation very various and questionable material is being built, in some instances gold, silver, and stones of value, in others wood, hay, stubble.