If the splendour of a thousand Suns was to blaze all at once (simultaneously) in the sky, that would be like the splendour of that Mighty Being (great soul).

divi = in the sky; sūrya = of suns; sahasrasya = of many thousands; bhavet = there were; yugapat = simultaneously; utthitā = present; yadi = if; bhāḥ = light; sadṛśī = like that; sa = that; syāt = might be; bhāsaḥ = effulgence; tasya = of Him; mahātmanaḥ = the great Lord.;