Thucydides 1.2.4 (tr. Richard Crawley):
The goodness of the land favored the aggrandisement of particular individuals, and thus created faction which proved a fertile source of
ruin. It also invited invasion.
διὰ γὰρ ἀρετὴν γῆς αἵ τε δυνάμεις τισὶ μείζους ἐγγιγνόμεναι στάσεις ἐνεποίουν ἐξ ὧν ἐφθείροντο, καὶ ἅμα ὑπὸ ἀλλοφύλων μᾶλλον ἐπεβουλεύοντο.
E.C. Marchant ad loc.:
When Greece was in the village stage, (1) the inhabitants of some districts grew (comparatively) wealthy, and as a consequence there were disputes between the 'haves' and 'have-nots'; (2) these fertile districts excited the cupidity of other clans.
Latin crib by Friedrich Gottlob Haase:
Nam propter soli bonitatem et opes nonnullis admodum auctae seditiones inferebant, quibus perdebantur, et simul alienigenarum insidiis magis appetebantur.