Bhagavad Gita 11.40नमः पुरस्तादथ पृष्ठतस्ते नमोऽस्तु ते सर्वत एव सर्व।अनन्तवीर्यामितविक्रमस्त्वं सर्वं समाप्नोषि ततोऽसि सर्वः ॥

The words I prostrate myself before Thee, behind Thee and on every side indicate the allpervading nature of the Lord. How can the allpervading Self have front and back Finite objects only have front and back sides Arjuna imagined that there were front and back sides to the Lord and so prostrated himself in his extreme faith and devotion.O All Nothing exists without Thee. As the Self is allpervading, He is called the All. There is nothing except the Self.On every side, as Thou art present everywhere or in all quarters.One may be powerful but may not possess the courage to kill the enemies or he may be endowed with a mild form of courge but the Lord is infinite in courage and infinite in power.Pervadest by Thy One Self.