Vetus est enim lex illa iustae veraeque amicitiae quae mihi cum illo iam diu est, ut idem amici semper velint, neque est ullum amicitiae certius vinculum quam consensus et societas consiliorum et voluntatum.

-- M. Tulli Ciceronis Oratio pro Plancio II, 5

There is an ancient law to a truthful and fair friendship, such as the one I had with him for a long time: that is, friends always want the same things and so there is no more stable bond than harmony and commonality of projects and will.

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Additus a. d. XV Kal. Oct., MMDCCLXXVI a. U. c.