Generate an image of the biblical verse - Galatians 3:29, 'And if ye be Christ's, then are ye Abraham's seed, and heirs according to the promise.' Please ensure the verse is depicted in a manner that suggests illumination, projected onto a parchment-like surface. The surrounding elements could be gothic arches releasing ethereal light, not unlike stained glass windows of a early 14th century church. The overall style should align with the era of medieval manuscript illumination, traditionally completed with ink and pigments on parchment.