The Motto of Indian Air Force has been taken from eleventh chapter of the Gita, the Discourse given by Lord Krishna to Arjuna on the battlefield of Kurukshetra during the Great War of Mahabharata. The Lord is showing His Supreme Divine form to Arjuna and the great form of the Lord is reaching the sky with glory, evoking fear and loss of self-control in the mind of Arjuna. The Indian Air Force, similarly, aims to overwhelm the adversaries with application of aerospace power in defence of the nation.
Lord, seeing your form Touching the Sky With Glory, effulgent, multi-coloured, having its mouth wide open and possessing large flaming eyes, I, with my innermost self frightened, have lost self-control and find no peace.
-Srimad Bhagavadgita, Chapter XI, Verse 24