“The roof of any house stands upon the foundations and the rest of the
structure. The foundations themselves are laid in order to carry the roof.
This is both useful and necessary, for the roof cannot stand without the
foundations and the foundations are absolutely useless without the roof –
no help to any living creature. In the same way the grace of God is
preserved by the practice of the commandments, and the observance of these
commandments is laid down like foundations through the gift of God. The grace of the Spirit cannot remain with us without the practice of the commandments, but the practice of the commandments is of no help or advantage to us without the grace of God.”

St. Symeon the New Theologian.