Deuteronomy 28:34 Midrash

וְהָיִ֖יתָ מְשֻׁגָּ֑ע מִמַּרְאֵ֥ה עֵינֶ֖יךָ אֲשֶׁ֥ר תִּרְאֶֽה׃

so that thou shalt be mad for the sight of thine eyes which thou shalt see.

Read midrashic interpretation of Deuteronomy 28:34: and classical rabbinic exegesis.