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. As a wise master builder - Ὡς σοφος αρχιτεκτων. The design or plan of the building is from God; all things must be done according to the pattern which he has exhibited; but the execution of this plan was entrusted chiefly to St. Paul; he was the wise or experienced architect which God used in order to lay the foundation; to ascertain the essential and immutable doctrines of the Gospel - those alone which came from God, and which alone he would bless to the salvation of mankind.
Let every man take heed how he buildeth thereupon - Let him take care that the doctrines which he preaches be answerable to those which I have preached; let him also take heed that he enjoin no other practice than that which is suitable to the doctrine, and in every sense accords with it.