namaḥ purastād atha pṛṣṭhatas te
namo 'stu te sarvata eva sarva
ananta-vīryāmita-vikramas tvaḿ
sarvaḿ samāpnoṣi tato 'si sarvaḥ
namaḥ — offering obeisances; purastāt — from the front; atha — also; pṛṣṭhataḥ — from behind; te — unto You; namaḥ astu — I offer my respects; te — unto You; sarvataḥ — from all sides; eva — indeed; sarva — because You are everything; ananta- vīrya — unlimited potency; amita- vikramaḥ — and unlimited force; tvam — You; sarvam — everything; samāpnoṣi — You cover; tataḥ — therefore; asi — You are; sarvaḥ — everything.
Out of loving ecstasy for Krishna, his friend, Arjuna is offering his respects from all sides. He is accepting that He is the master of all potencies and all prowess and far superior to all the great warriors assembled on the battlefield. It is said in the Vishnu Purana (1.9.69):
"Whoever comes before You, be he a demigod, is created by You, O Supreme Personality of Godhead."