John Wesley on Revelation 12:2

And being with child she crieth, travailing in birth - The very pain, without any outward opposition, would constrain a woman in travail to cry out. These cries, throes, and pains to be delivered, were the painful longings, the sighs, and prayers of the saints for the coming of the kingdom of God. The woman groaned and travailed in spirit, that Christ might appear, as the Shepherd and King of all nations.