John Chrysostom
He often reminds them with this saying, “Beware lest your heart be deceived,” urging them to recognize that their triumphs are not due to their own power but rather to the grace of God.
See Psalm 118:71
And thou shalt have eaten and be full:
הִשָּׁ֣מֶר לְךָ֔ פֶּן־תִּשְׁכַּ֖ח אֶת־יְהוָ֑ה אֲשֶׁ֧ר הוֹצִֽיאֲךָ֛ מֵאֶ֥רֶץ מִצְרַ֖יִם מִבֵּ֥ית עֲבָדִֽים׃
One Church Father comments on this verse
He often reminds them with this saying, “Beware lest your heart be deceived,” urging them to recognize that their triumphs are not due to their own power but rather to the grace of God.
See Psalm 118:71