T 2 Cic. Fam. 3.11.4 [ad Appium Pulchrum]
...tuumque simul promptum animum et alacrem perspexi ad defendendam rem publicam.... nam auguralis libros ad commune utriusque nostrum otium serva. ego enim a te cum tua promissa per litteras flagitabam, ad urbem te otiosissimum esse arbitrabar. nunc tamen, ut ipse polliceris, pro auguralibus libris orationes tuas confectas omnis exspectabo.
T 3 Cic. Fam. 2.13.2 [ad Caelium Rufum]
ego Appium, ut saepe tecum locutus sum, valde diligo meque ab eo diligi statim coeptum esse ut simultatem deposuimus sensi. nam et honorificus in me consul fuit et suavis amicus et studiosus studiorum etiam meorum. mea vero officia ei non defuisse tu es testis ... quid est causae cur mihi non in optatis sit complecti hominem florentem aetate, opibus, honoribus, ingenio, liberis, propinquis, adfinibus, amicis, collegam meum praesertim et in ipsa collegi laude et scientia studiosum mei? ... genus institutorum et rationum mearum dissimilitudinem non nullam habet cum illius administratione provinciae. ex eo quidam suspicati fortasse sunt animorum contentione, non opinionum dissensione, me ab eo discrepare. nihil autem feci umquam neque dixi quod contra illius existimationem esse vellem; post hoc negotium autem et temeritatem nostri Dolabellae deprecatorem me pro illius periculo praebeo.
T 2 Cicero, Letters to Friends [to Appius Pulcher]
...and at the same time I have noticed your ready and eager spirit in the defense of the Republic.... So keep the books on augury until both of us have time to spare. For when I demanded from you the fulfillment of your pledge in a letter, I imagined you near the city [of Rome] with lots of time to spare. But now I will expect, as you yourself promise, the edition of your complete speeches instead of the books on augury.
T 3 Cicero, Letters to Friends [to Caelius Rufus]
I have a real regard for Appius, as I have often told you, and I perceived that I began to be respected by him as soon as we buried our hatchet. For as consul [54 BC] he was conferring honors upon me, a pleasant friend, and even keen on my literary pursuits. In fact, that friendliness toward him on my side was not wanting you can testify ... What reason is there that it should not be desirable for me to embrace a man flourishing in the prime of life, wealth, offices, ability, children, connections of blood and marriage, friends, in particular a colleague of mine [as augur] and [showing himself] devoted to me precisely by the learned praise of our college? ... The character of my ordinances and principles has some dissimilarity to his administration of the province [Cilicia]. Hence perhaps some have suspected that I differ from him out of personal animus, not from theoretical disagreement. But I have never said or done anything out of a desire to injure his reputation; and after this recent trouble and our friend Dolabella’s precipitate behavior [P. Cornelius Dolabella (173), prosecuting Pulcher de maiestate], I am ready with my intercession on his behalf in the hour of danger.