27. Of all the things which the wise man seeks to acquire to produce the happiness of a complete life, by far the most important is the possession of friendship.

Alternate Translations: Bailey: Of all the things which wisdom acquires to produce the blessedness of the complete life, far the greatest is the possession of friendship. Strodach: Of all the things that wisdom provides for the happiness of the whole man, by far the most important is the acquisition of friendship.

Cicero’s Defense of Epicurus: There remains a topic that is supremely relevant to this discussion – the subject of Friendship. Your [Platonic] school maintains that if pleasure is held to be the Chief Good, friendship will cease to exist. In contrast, Epicurus has pronounced in regard to friendship that of all the means to happiness that wisdom has devised, none is greater, none is more fruitful, none is more delightful than friendship. Not only did Epicurus commend the importance of friendship through his words, but far more, through the example of his life and his conduct. How rare and great friendship is can be seen in the mythical stories of antiquity. Review the legends from the remotest of ages, and, many and varied as they are, you will barely find in them three pairs of friends, beginning with Theseus and ending with Orestes. Yet Epicurus in a single house (and a small one at that) maintained a whole company of friends, united by the closest sympathy and affection, and this still goes on today in the Epicurean school. … The Epicureans maintain that friendship can no more be separated from pleasure than can the virtues, which we have discussed already. A solitary, friendless life is necessarily beset by secret dangers and alarms. Hence reason itself advises the acquisition of friends. The possession of friends gives confidence and a firmly rooted hope of winning pleasure. And just as hatred, jealousy and contempt are hindrances to pleasure, so friendship is the most trustworthy preserver and also creator of pleasure for both our friends and for ourselves. Friendship affords us enjoyment in the present, and it inspires us with hope for the near and distant future.

Thus it is not possible to secure uninterrupted gratification in life without friendship, nor to preserve friendship itself unless we love our friends as much as ourselves. … For we rejoice in our friends’ joy as much as in our own, and we are equally pained by their sorrows. Therefore the wise man will feel exactly the same towards his friends as he does towards himself, and he will exert himself as much for his friend’s pleasure as he would for his own. All that has been said about the essential connection of the virtues with pleasure must be repeated about friendship. Epicurus well said (and I give almost his exact words): “The same creed that has given us courage to overcome all fear of everlasting or long-enduring evil after death has discerned that friendship is our strongest safeguard in this present term of life. … All these considerations go to prove not only that the rationale of friendship is not impaired by the identification of the chief good with pleasure, but, in fact, without this, no foundation for friendship whatsoever can be found.”

Vatican Saying 78: The noble soul occupies itself with wisdom and friendship; of these the one is a mortal good, the other immortal.