Infinitive

Infinitive verbs have no endings for person or number and usually coordinate with another verb.

Περὶ δὲ τῶν πνευματικῶν ἀδελφοί οὐ θέλω ὑμᾶς ἀγνοεῖν
Now concerning spiritual things, brothers, I don't want you to be ignorant.
Μηδενὶ μηδὲν ὀφείλετε εἰ μὴ τὸ ἀλλήλους ἀγαπᾶν
Owe no one anything, except to love one another