[IDEM libro uicensimo quarto ad Sabinum. ] §18.5.2.prSi quam rem a te emi, eandem rursus a te pluris minorisue emero, discessimus a priore emptione (potest enim, dum res integra est, conuentione nostra infecta fieri emptio) atque ita consistit posterior emptio, quasi nulla praecesserit.
[THE SAME, Book 24 on Sabinus.] If I have bought some thing from you, and then buy the same thing back from you again for more or less, we have withdrawn from the prior sale (for, as long as the matter is untouched, a sale can be made undone by our agreement) and thus the subsequent sale stands, just as if no sale had preceded it.
sed non poterimus eadem ratione uti post pretium solutum emptione repetita, cum post pretium solutum infectam emptionem facere non possumus.
But we will not be able to use the same reasoning upon a repeated sale after the price has been paid, since after the price has been paid we cannot make the sale undone.