The Iliad 10.220–226

Nestor, my heart and proud spirit urge me to enter the camp of the foemen that are near, even of the Trojans; howbeit if some other man were to follow with me, greater comfort would there be, and greater confidence. When two go together, one discerneth before the otherhow profit may be had; whereas if one alone perceive aught, yet is his wit the shorter, and but slender his device. So spake he, and many there were that were fain to follow Diomedes. Fain were the two Aiantes, squires of Ares, fain was Meriones, and right fain the son of Nestor, how profit may be had; whereas if one alone perceive aught, yet is his wit the shorter, and but slender his device.