Aurelius, Meditations §aur_06_xlvii: It is in thy power absolutely to exclude all manner of conceit and opinion, a...

It is in thy power absolutely to exclude all manner of conceit and opinion, as concerning this matter; and by the same means, to exclude all grief and sorrow from thy soul. For as for the things and objects themselves, they of themselves have no such power, whereby to beget and force upon us any opinion at all.