Bhagwad Gita
Chapter 6, Verse 10
योगी युञ्जीत सततमात्मानं रहसि स्थितः।
एकाकी यतचित्तात्मा निराशीरपरिग्रहः।।6.10।।
A transcendentalist should always try to concentrate his mind on the Supreme Self; he should live alone in a secluded place and should always carefully control his mind. He should be free from desires and feelings of possessiveness.