reck (one's) own rede
To trust in and use one's own advice. "Reck" means "to heed," while "rede" means "advice"; both are archaic words. A: "I have told my sister to question men she deems untrustworthy." B: "Then, my lady, if you do not trust Sir Walton, I think you need to reck your own rede and confront him."