A question about Ishavasya Upanishad.
We know that the first word of Ishavasya Upanishad is īśā(ईशा) meaning 'Lord' or 'Master'.Now,I don't understand why the long vowel ā(aa) is used.Isn't it the same as īśa(ईश ) ?Does the long vowel in īśā have any significance?Pardon my Sanskrit,I don't have much knowledge on how grammar works I hope members here can help me on this issue.
"Only one is the fire,which is inflamed in numerous ways.Only one is the sun, which pervades the whole universe.Only one is the dawn,which illuminates all things. Similarly,all that exists is The One and it has manifested into everything here.”
~ Rg Veda 8.58.2