Bhagavad Gita 6.19

यथा दीपो निवातस्थो नेङ्गते सोपमा स्मृता।योगिनो यतचित्तस्य युञ्जतो योगमात्मनः॥

yathā dīpo nivātastho neṅgate sopamā smṛtā |yogino yatacittasya yuñjato yogamātmanaḥ ||

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.

The wise man who has conquered his mind and is absorbed in the Self is like a lamp that does not flicker, as it stands sheltered from every wind.

Our plain-language meaning of this verse is waiting for scholar review.