10:42  

अथवा बहुनैतेन किं ज्ञातेन तवार्जुन ।
विष्टभ्याहमिदं कृत्स्नमेकांशेन स्थितो जगत् ॥१०- ४२॥

athawaa bahunaitena kiM dnyaatena tawaarjuna ।

wiShTabhyaahamidaM kRRitsnamekaaMshena sthito jagat ॥१०- ४२॥

Source: Automatic ITRANS Transliteration

However, what is this detailed knowledge to you, O Arjuna?
I establish the totality of this extant world with a fraction [of Myself].

Source: Milind S. Pandit

What is the need for this detailed knowledge, O Arjuna? I continually support the entire universe by a small fraction of My energy.

Source: The Bhagavad-Gita: The Sacred Song

But what need is there, Arjuna, for all this detailed knowledge? With a single fragment of Myself I pervade and support this entire universe.

Source: Bhagavad Gita As It Is