Verse
यथा दीपो निवातस्थो नेङ्गते सोपमा स्मृता ।योगिनो यतचित्तस्य युञ्जतो योगमात्मनः ॥
yathā dīpo nivātastho neṅgate sopamā smṛtāyogino yatacittasya yuñjato yogamātmanaḥ
Motionless like the light of lamp in a windless place is the controlled consciousness (free from its restless action, shut in from its outward motion) of the Yogin who practices union with the Self.
Gītā 6·19