A clause inside reported speech or thought, or inside another subjunctive clause, takes the subjunctive even when it states a plain fact; translate it as an indicative.
When a statement is reported (accusative and infinitive, indirect question, ut clause, quod "that"), the relative, causal, temporal and si clauses within it usually turn subjunctive: quod omnia … consimilia fuerint "that all things have been alike", after meminisse.
The same happens by attraction: a clause depending on a subjunctive clause tends to be subjunctive too (quo minus ea facias …, quae … consentanea fuerint).
Translate these subjunctives as ordinary indicatives. If such a clause keeps the indicative, it is the writer's own remark: cujus pars es "of which you are a part" (a fact).
quod or quia + subjunctive gives a reason as someone's view, often one being rejected: ideo …, quia … non animadverterit "because (as one might suppose) he did not notice".