καρδίᾳ (kardia) in Colossians 3:16: Noun Dative Singular Feminine

Noun: the word names the inner life, center, or seat of a person's thought and willing here.

Dative: the form usually marks an indirect relation, location, means, or sphere, and here it works with the preposition to show the setting of the action.

Singular: the form is grammatically singular in this occurrence, pointing to one heart as the inner sphere in view.

Feminine: the noun belongs to the feminine grammatical class, which does not by itself create any gendered theological claim.

ἐν

The noun is governed by the preposition ἐν in the phrase ἐν τῇ καρδίᾳ ὑμῶν, so it names the sphere or setting in which the singing happens.

It functions as part of a locative or spheral dative phrase, describing inward participation in the singing that is offered to the Lord.

It does not by itself name the subject, object, or direct recipient of the singing, and the form alone does not decide more than the local phrase suggests.

Moderate: The dative phrase shapes the inward setting of the singing but does not carry the whole command in Colossians 3:16.

Dative singular in a prepositional phrase. marks the inward sphere of worshipful singing. Attached to singing with grace in the heart. Governed by the preposition en in the phrase in your heart. The phrase points to inward engagement, not merely anatomical location.

Where does the singing take place? The phrase places grace-shaped singing in the heart, the inward sphere named by the verse.

Direct: The form directly supports a rendering such as in your heart or in your hearts.

The dative with en can mark location or sphere; the verse frames this as inward participation in worship. Grammatical gender here is noun class, not a claim about male or female readers.

Dative case proves private worship only: The phrase marks inward engagement, while the verse also speaks to shared teaching and singing.

The witness reads καρδίᾳ in Colossians 3:16 within the phrase ἐν τῇ καρδίᾳ ὑμῶν τῷ Κυρίῳ.

The lemma καρδία means heart, the inner life, intention, or center of personal life.

With ἐν, the dative points to the inward sphere in which the community sings. The grammar supports an interior mode of worship, but the sentence still frames this as one part of a larger communal pattern of teaching, admonishing, and singing.

The verse encourages Christ's word to dwell richly and then describes communal instruction and song that arise from grace and inward devotion. The heart language emphasizes sincerity and inward engagement.

This fits broader biblical use of the heart as the seat of thought, will, and devotion, while staying within the local call to Christ-centered instruction and praise.

For teaching and translation, the phrase can be rendered as singing in the heart or from the heart, with the context deciding the best nuance.

Do not derive a claim that the noun changes meaning into a different word, or that grammar alone proves private worship, emotional intensity, or any specific theology beyond the phrase's inward orientation.