In connection with what has been said above, it seems proper to consider whether more notable instances of ingratitude are supplied by princes or peoples. And, to go to the root of the matter, I affirm that this vice of ingratitude has its source either in avarice or in suspicion. For a prince or people when they have sent forth a captain on some important enterprise, by succeeding in which he earns a great name, are bound in return to reward him; and if moved by avarice and covetousness they fail to do so, or if, instead of rewarding, they wrong and disgrace him, they commit an error which is not only without excuse, but brings with it undying infamy. And, in fact, we find many princes who have sinned in this way, for the cause given by Cornelius Tacitus when he says, that “_men are readier to pay back injuries than benefits, since to requite a benefit is felt to be a burthen, to return an injury a gain_.”[3] [3] Proclivius est injuriæ quam beneficio vicem exsolvere, quia gratia oneri, ultio in quastu habetur. _Tacit. Hist._ iv. 2. When, however, reward is withheld, or, to speak more correctly, where offence is given, not from avarice but from suspicion, the prince or people may deserve some excuse; and we read of many instances of ingratitude proceeding from this cause. For the captain who by his valour has won new dominions for his prince, since while overcoming his enemies, he at the same time covers himself with glory and enriches his soldiers, must needs acquire such credit with his own followers, and with the enemy, and also with the subjects of his prince, as cannot be wholly agreeable to the master who sent him forth. And since men are by nature ambitious as well as jealous, and none loves to set a limit to his fortunes, the suspicion which at once lays hold of the prince when he sees his captain victorious, is sure to be inflamed by some arrogant act or word of the captain himself. So that the prince will be unable to think of anything but how to secure himself; and to this end will contrive how he may put his captain to death, or at any rate deprive him of the credit he has gained with the army and among the people; doing all he can to show that the victory was not won by his valour, but by good fortune, or by the cowardice of the enemy, or by the skill and prudence of those commanders who were with him at this or the other battle.