Unity (henotēs)

Ephesians 4:3 Unity
Endeavouring to keep the unity(henotēs) of the Spirit in the bond of peace.

Literal
and diligently safeguarding the unity of the spirit in the bond which is peace,

Expanded
and diligently and watchfully endeavoring to safeguard the unity of the spirit, staying spiritually unified, being bound together by the bond which is peace.

Rotherham
Giving diligence to keep—the oneness of the Spirit in the uniting-bond of peace

Eph 4:13
Till we all come in the unity(henotēs) of the faith, and of the knowledge of the Son of God, unto a perfect man, unto the measure of the stature of the fulness of Christ:

The way you become likeminded with someone is being likeminded on the Word (knowledge of the Son of God).