Dear saints, let us pray that the saints would follow the pattern of the apostle in learning to travail in birth over their spiritual children until Christ is formed in them (Gal. 4:19).
Paul told the Galatian believers that he was again travailing on their behalf. Travail refers to painful labor in childbirth. In this metaphor Paul likens himself to a mother who gives birth to a child. He labored in this way for the regeneration of the Galatians when he first preached the gospel to them. Because they had deviated from the gospel he preached to them, he labors again in travail until Christ is formed in them. In this verse Paul likens himself both to a begetting father and a travailing mother. Was he, then, a father or a mother? He was both, depending on the situation. On one occasion he was a begetting father; on another, a travailing mother…
Christ was born into the Galatian believers, but not formed in them, when they were regenerated through Paul’s preaching the gospel to them the first time. Now the apostle travails again that Christ might be formed in them. To have Christ formed in us is to have Christ grown in us in full. First Christ was born into us at our conversion, then He lives in us in our Christian life (2:20), and He will be formed in us at our maturity. This is needed that we may be sons of full age, heirs to inherit God’s promised blessing, and mature in the divine sonship. (Witness Lee, Life-study of Galatians, msg. 23, pp. 204-205)
More details via Beseeching.org, day 383.