Bhagwad Gita
Chapter 2, Verse 57
यः सर्वत्रानभिस्नेहस्तत्तत्प्राप्य शुभाशुभम्।
नाभिनन्दति न द्वेष्टि तस्य प्रज्ञा प्रतिष्ठिता।।2.57।।
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.