The Apostle Paul
Romans 8:14BSB·traditional attribution

For all who are led by the Spirit of God are sons of God.

John Calvin Reformed @genevareformer

14. For whosoever are led by the Spirit of God, etc. This is a confirmation of what has immediately preceded; for he teaches us, that those only are deemed the sons of God who are ruled by his Spirit; for by this mark God acknowledges them as his own people.

Matthew Henry Presbyterian @wholebiblehenry

In these verses the apostle represents two more excellent benefits, which belong to true believers. I. Life. The happiness is not barely a negative happiness, not to be condemned; but it is positive, it is an advancement to a life that will be the unspeakable happiness of the man (Rom 8:10, Rom 8:11): If Christ be in you. Observe, If the Spirit be in us, Christ is in us.

Commenting on Romans 8:10-16

John Gill Reformed Baptist @doctorgill

For as many as are led by the Spirit of God,.... Not by the spirit of the world, or of the devil, or by their own spirits: the act of leading ascribed to the Spirit is either in allusion to the leading of blind persons, or such who are in the dark; or rather to the leading of children and teaching them to go; which...