Chapter 6 · The Yoga of Meditation · Krishna said
Bhagavad Gita 6.19 — Lamp in a windless place
यथा दीपो निवातस्थो नेङ्गते सोपमा स्मृता। योगिनो यतचित्तस्य युञ्जतो योगमात्मनः ॥
yathā dīpo nivātastho neṅgate sopamā smṛtā | yogino yatacittasya yuñjato yogamātmanaḥ ||
Meaning
As a lamp in a windless place does not flicker — that is the image used for the controlled mind of a yogi absorbed in meditation on the Self.
In today's life
Sit quietly for a few minutes daily and hold your attention in one place — slowly the mind grows steady like a lamp out of the wind.