[65] Some men also, being engaged in traffic, do out of desire for gain sail over the sea, or being employed in some embassy, or being led by a desire to see the sights of foreign countries, or by a love for instruction, having various motives which attract them outwards and prevent their remaining where they are, some being led by a love of gain, others by the idea of being able to benefit their native city at its time of need in the most necessary and important particulars, others seeking to arrive at the knowledge of matters of which before they were ignorant, a knowledge which brings, at the same time, both delight and advantage to the soul. For men who have never travelled are to those who have, as blind men are to those who see clearly, are nevertheless anxious to behold their father’s threshold and to salute it, and to embrace their acquaintances, and to enjoy the most delightful and wished-for sight of their relations and friends; and very often, seeing the affairs, for the sake of which they left their country, protracted, they have abandoned them, being influenced by that most powerful feeling of longing for a union with their kindred.