Plutarch, Praecepta gerendae reipublicae
Harold North Fowler, Ed.

But anyone who is entering upon a public career should choose as his leader a man who is not merely of established reputation and powerful, but one who is all this on account of real worth. For just as not every tree will accept and support the grape-vine which entwines itself about it, but some trees stifle and ruin its growth, so in States, the men who are not lovers of what is noble, but merely lovers of honours and of office, do not afford young men opportunities for public activities, but through [p. 201] envy repress them and, to speak figuratively, wither them up by depriving them of glory, their natural nourishment. So Marius, after having achieved many successes in Libya and again in Gaul with the help of Sulla, ceased to employ him and cast him off, being angered by his growth in power, but using the incident of the seal as a pretext. For Sulla, when Marius was general and he was quaestor¹ in Libya, was sent by Marius to Bocchus and took Jugurtha prisoner ; and being a young man who had just had his first taste of glory, he did not bear his good fortune with moderation, but had a seal engraved with a representation of his deed - Jugurtha surrendering to him - and wore it.² Marius threw this up against him and cast him off. And Sulla, transferring his allegiance to Catulus and Metellus, worthy men and opposed to Marius, quickly drove Marius out and broke his power in the civil war after he had almost overthrown Rome. Sulla, however, exalted Pompey from the time of his youth, rising up and uncovering his head when he came near ; and also by giving the other young men opportunities for acts of leadership and even by urging some on against their will, he filled his armies with ambition and eagerness ; and he gained power over them all by wishing to be, not the only great man, but first and greatest among many great ones. Such, then, are the men to whom young statesmen should attach themselves and cling closely, not snatching glory away from them, like Aesop's wren who was carried up on the eagle's shoulders, then suddenly flew out and got ahead of him, but [p. 203] receiving it from them in goodwill and friendship, knowing that no one can ever command well who has not first learned rightly to obey, as Plato says.³