Restraining words and the senses should practise Yoga after dusk and before dawn seated on a mountain summit, or at the foot of a huge tree or with a tree before him.
कुर्यात् परिचयं योगे त्रैकाल्ये नियतो मुनिः। गिरि शृङ्गे तथा चैत्ये वृक्षाग्रेषु च योजयेत्॥