Foresight of phenomenon and power over them depend on knowledge of their sequences, and not upon any notion we may have formed respecting their origi… - John Stuart Mill

Banyak kebenaran yang baru kita sadari maknanya setelah kita alami sendiri.

War is an ugly thing, but not the ugliest of things: the decayed and degraded state of moral and patriotic feeling which thinks nothing worth a war, is worse. A man who has nothing which he cares about more than he does about his personal safety is a miserable creature who has no chance of being free, unless made and kept so by the existing of better men than himself.

The following are the classes into which, according to this school of philosophy, Things in general might be reduced: Οὐσία, Substantia. Ποσὸν, Quantitas. Ποιόν, Qualitas. Πρός τι, Relatio. Ποιεῖν, Actio. Πάσχειν, Passio. Ποῦ, Ubi. Πότε, Quando. Κεῖσθακ, Situs. Ἔχειν, Habitus.