Book XII · 22

Consider that everything is opinion, and opinion is in thy power. Take away then, when thou choosest, thy opinion, and like a mariner who has doubled the promontory, thou wilt find calm, everything stable, and a waveless bay.

Remember that all is but as thy opinion of it, and that is in thy power. Efface thy opinion then, as thou mayest do at will, and lo, a great calm! Like a mariner that has turned the headland thou findest all at set-fair and a halcyon sea.