Surah 19. Maryam, Ayah 61

This lengthy paraphrase of the expression bi'l-ghayb gives, I think, the closest possible interpretation of the idea underlying it: namely, the prospect of a reality which is inconceivable by man in terms of his worldly experiences, and which can, therefore, only be hinted at by means of allegorical allusions. (See also the first clause of 2:3 and the corresponding note [3].)