2:57  

यः सर्वत्रानभिस्नेहस्तत्तत्प्राप्य शुभाशुभम् ।
नाभिनन्दति न द्वेष्टि तस्य प्रज्ञा प्रतिष्ठिता ॥२- ५७॥

yaH sarwatraanabhisnehastattatpraapya shubhaashubham ।

naabhinandati na dweShTi tasya pradnyaa pratiShThitaa ॥२- ५७॥

Source: Automatic ITRANS Transliteration

One who, everywhere without desire, obtaining the auspicious or the inauspicious
Neither welcomes nor hates, respectively, that one's insight is stabilized.

Source: Milind S. Pandit

Those who are not attached to anything, who are neither elated by getting desired results nor troubled by undesired results, their Prajna is deemed steady.

Source: The Bhagavad-Gita: The Sacred Song

He who is without attachment, who does not rejoice when he obtains good, nor lament when he obtains evil, is firmly fixed in perfect knowledge.

Source: Bhagavad Gita As It Is