More Envious Than A Snake

It is said, sarpah krurah khalah krurah sarpat kruratarah khalah: “The snake
is very crooked and envious, and so also is a person like a demon.”
Mantrausadhi-vasah sarpah khalah kena nivaryate: “One can bring a snake
under control with mantras, herbs and drugs, but an envious and crooked
person cannot be brought under control by any means.”
>>> Ref. VedaBase => SB 8.9.19