You can't teach an old dog new tricks. Eschew the implement of correction and vitiate the scion. Spare the rod and spoil the child. The temperature of aqueous content of an unremittingly ogled saucepan does not reach 212 fahrenheit. A watched pot never boils.
Male cadavers are incapable of yielding any testimony.
Dead men tell no tales. Individuals who make their abode in vitreous edifices would be advised to refrain from catapulting petrous projectiles. People who live in glass houses shouldn't throw stones. All articles that coruscate with resplendence are not truly auriferous. All that glitters is not gold.