Transcending passion, fear and anger, reflecting constantly upon Me, taking refuge in Me, many have become like Me getting purified by knowledge-austerity.
Krishna brings the concept of jñāna-tapas, knowledge – austerity, explaining how it works in a true sādhaka. The statement has immense relevance and benefit.
To be devoted to anyone is to reflect upon him consistently, become like him. This warrants the mind to be free from the hold of desire, hatred and fear.
Normally everyone acts motivated by desire, hatred and fear. With every act these only grow in number and strength. As age advances they become more, filling the mind with agitation, stress and discontent. Krishna wants this plight redressed right from the beginning.
For that, one has to sublimate the desire-hatred-fear every time. Learn to live without this trio. This is real spiritual culture, refinement, to make you like Krishna.
What a great statement, promise, assurance and hope! What more does any intelligent human look for?