Quitting your Job, Better a Sweet Lie than a Bitter Outburst

Whether moving to a new gig, starting a business or just wanting to quit because you lost appetite for current job, leaving on a gracious note (when possible) is wise.

Plan your departure with a cool head suggests Sack the boss but keep it sweet (Rhymer Rigby, FT).
He offers that in some cases rather than express your discontent if there is ground for it you are better off giving a sweet lie of leaving to pursue other opportunities.