Kitab-i-Iqan — Paragraph 87

And now, inasmuch as these holy beings have sanctified themselves from every human limitation, have become endowed with the attributes of the spiritual, and have been adorned with the noble traits of the blessed, they therefore have been designated as “angels.” Such is the meaning of these verses, every word of which hath been expounded by the aid of the most lucid texts, the most convincing arguments, and the best established evidences.