Bhagavatapurana 3.29.20

3.29.20

yathā vāta-ratho ghrāṇam āvṛṅkte gandha āśayāt /
evaṃ yoga-rataṃ ceta ātmānam avikāri yat //

20. Just as fragrance travelling from its source by the vehicle of the wind brings the organ of smell under its influence (takes possession of it), so also the mind constant in yoga and hence in an unperturbed state is capable of comprehending and realising the Atman.