UtshovBhagavad Gita 6.19
यथा दीपो निवातस्थो नेङ्गते सोपमा स्मृता।
योगिनो यतचित्तस्य युञ्जतो योगमात्मनः।।6.19।।
Yatha dipo nivatastho nengate sopama smrita
Yogino yatachittasya yunjato yogamatmanah
Simple meaning, written by AIAs a lamp in a windless place does not flicker, the same is recalled as the comparison for a yogi whose mind is restrained and who practises yoga of the Self.