Looking for hidden meaning in seemingly unrelated events? Portents of doom always make for a good story, says Statius

Quis fluere occultis rerum neget omina causis?

Who can deny that omens flow from hidden causes?

Quis (who) is an interrogative pronoun in the nominative singular form.

Neget (denies) is the third person singular present active subjunctive of "negare" meaning "to deny" or "to refuse."

Fluere (to flow) is in the present active infinitive.

Omina (omens) is the nominative plural form of "omen."

Causis (causes) is the ablative plural form of "causa."

Occultis (hidden) is the ablative plural form of "occultus," agreeing with causis.

Rerum (of things) is the genitive plural form of "res."