Bhagwad Gita
Chapter 2, Verse 71
विहाय कामान्यः सर्वान्पुमांश्चरति निःस्पृहः।
निर्ममो निरहंकारः स शांतिमधिगच्छति।।2.71।।
A person who has given up all desires for sense gratification, who lives free from desires, who has given up all sense of proprietorship and is devoid of false ego - he alone can attain real peace.