You say namaste every day. After seeing the universal form, Arjuna cannot stop: hail to you a thousand times, again and again.
Going deeper
In chapter 11 Arjuna has seen the universal form, and by the middle of the chapter he cannot stop praising. 11.38 calls the form the primal God, the ancient person and the supreme resting place of the universe. 11.39 names the wind, Yama, Agni, Varuṇa, the moon, Prajāpati and the great-grandsire, and then says namo namas te: hail to you a thousand times, and again and yet again. Namaste is the word you use in greeting, and here Arjuna says it to the one who pervades all beings. 11.40 carries on: salutations from before and from behind, salutations from all sides. In these verses the word is repeated because one saying is not enough. The scene is in chapter 11, and what the Gītā says about devotion gathers related verses.