Nor source, nor midst, nor end; infinite force, Unnumbered arms, the sun and moon Thine eyes I see Thy face, as sacrificial fire Blazing, its splendour burneth up the worlds.
In plain words: Arjuna sees that Krishna has no beginning, middle or end, and endless strength and arms. The sun and moon are His eyes. His face blazes like a sacred fire, and its heat burns the whole world.