עָרֵ֣ב לָ֭אִישׁ לֶ֣חֶם שָׁ֑קֶר וְ֝אַחַ֗ר יִמָּֽלֵא־פִ֥יהוּ חָצָֽץ׃
Bread of falsehood is sweet to a man; but afterwards his mouth shall be filled with gravel.
Read kabbalistic (mystical) interpretation of Proverbs 20:17: and classical mystical sources.