यथा दीपो निवातस्थो नेङ्गते सोपमा स्मृता। योगिनो यतचित्तस्य युञ्जतो योगमात्मनः।।6.19।।
yathā dīpo nivāta-stho neṅgate sopamā smṛitā yogino yata-chittasya yuñjato yogam ātmanaḥ
As a lamp placed in a windless spot does not flicker, so is the Yogi of a controlled mind, who practices Yoga in the Self, compared.