Matthew 7:26

And everyone that heareth these sayings of mine
Who only externally hears them, but has no understanding of them; do not believe them, nor like and approve of them, but hates and despises them; or if not, depends upon his external hearing of them, and contents himself with a speculative knowledge, without the practice of them,

and doth them not;
does not yield the obedience of faith to the doctrines of the Gospel, nor submits to the ordinances of it, but neglects them, and all other duties of religion: or if he does obey, it is only outwardly, not from the heart; nor from a principle of love; nor in faith; nor in the name and strength of Christ; nor for the glory of God, but in order to obtain life for himself: such

shall be likened unto a foolish man, which built his house upon the
sand;
or, as Luke has it, "without a foundation upon the earth"; upon the surface of the earth, without digging into it for a foundation: and such may be said to build

without a foundation,
who pretend to make their peace with God by their own works; who hope for pardon on the foot of the mercy of God, and their own repentance; seek for justification by their own, and not the righteousness of Christ; look for acceptance with God, for the sake of their own worthiness; and who expect salvation in any other way than by Christ: as in each of these articles, they leave out Christ, they may be said to build without a foundation indeed, and to build "upon" the surface of "the earth"; as they do, who build their hope of salvation upon anything that is merely external; as, their riches and grandeur, their wisdom and learning, their natural descent, and religious education, their civility, courteousness, and what is called good nature, their liberality and alms deeds, their morality, common justice and honesty, their legal righteousness, whether moral or ritual, and a round of religious duties; and such may be said to "build upon the sand", on that which will bear no weight, but gives way, and sinks. The salvation of the soul is a weighty thing; and that which is like sand, as is everything of a man's own, can never support it: God has therefore laid the salvation of his people on his own Son; and he must be a "foolish man" that builds on anything short of him.