Deuteronomy 28:34 in the World English Bible
so that the sights that you see with your eyes will drive you mad.
Context
33 The fruit of thy land, and all thy labours, shall a nation which thou knowest not eat up; and thou shalt be only oppressed and crushed alway:
34 So that thou shalt be mad for the sight of thine eyes which thou shalt see.
35 The LORD shall smite thee in the knees, and in the legs, with a sore botch that cannot be healed, from the sole of thy foot unto the top of thy head.