Pelopidas (4.3-4.4)

And the true reason for the superiority of the Thebans was their virtue, which led them not to aim in their actions at glory or wealth, which are naturally attended by bitter envying and strife; on the contrary, they were both filled from the beginning with a divine desire to see their country become most powerful and glorious in their day and by their efforts, and to this end they treated one another’s successes as their own.

However, most people think that their ardent friendship dated from the campaign at Mantineia,[*] where they fought on the side of the Lacedaemonians, who were still their friends and allies, and who received assistance from Thebes. For they stood side by side among the men-at-arms and fought against the Arcadians, and when the Lacedaemonian wing to which they belonged gave way and was routed for the most part, they locked their shields together and repelled their assailants.