Bhagavad-gītā 6.19
BG 6.19
Open the full passageयथा दीपो निवातस्थो नेङ्गते सोपमा स्मृता । योगिनो यतचित्तस्य युञ्जतो योगमात्मनः ॥१९॥
Sanskrit
yathā dīpo nivāta-stho neṅgate sopamā smṛtā yogino yata-cittasya yuñjato yogam ātmanaḥ
Translation
As a lamp in a windless place does not waver, so the transcendentalist, whose mind is controlled, remains always steady in his meditation on the transcendent self.