If thou hast another, whom thou little trustest, yet wouldst good from him derive, thou shouldst speak him fair, but think craftily, and leasing pay with lying.
Ef þú át annan þanns þú illa trúir vildu af honum þó gótt geta fagrt skalt við þann mæla en flátt hyggja ok gjalda lausung við lygi
Havamal: 45, Gestaþáttr