We are from God (theou | θεοῦ | gen sg masc). The person who knows God (theon | θεόν | acc sg masc) listens to us, but whoever is not from God (theou | θεοῦ | gen sg masc) does not listen to us. By this we know the Spirit of truth and the spirit of error.
Reference
1 John 4:6
Sequence
1039