§69.1Fr. 69
Διὸ καὶ ὁρίζεται ὁ Θ. τὸν τόπον, ὡς ἤδη ἡμῖν ἐν τοῖς πρώτοις εἴρηται, οὕτως· "τόπος ἐστὶν ἀρχή τις ἢ στοιχεῖον, ἀφʼ οὗ λαμβάνομεν τὰς περὶ ἕκαστον ἀρχὰς, τῇ περιγραφῇ μὲν ὡρισμένος, τοῖς δὲ καθʼ ἕκαστα ἀόριστος. "
Therefore, Theophrastus also defines the topic, as has already been stated by us in the first parts, as follows: "A topic is a certain principle or element from which we derive the principles concerning each subject, being definite in outline but indefinite in respect of particulars."