When another man showed him a shield beautifully ornamented, he said, ‘ A fine shield, young sir; but it is more fitting that a Roman rest his hopes in his right hand rather than in his left.’ 1
1 So in Aelian, Varia Historia, xi. 9. Slightly variant versions are to be found in Polyaenus, Strategemata, viii. 16. 4; Frontinus, Strategemata, iv. 1. 5; Livy, Epitome of Book lvii.