Bhagavad-gītā 4.2
BG 4.2
Open the full passageएवं परम्पराप्राप्तमिमं राजर्षयो विदुः । स कालेनेह महता योगो नष्टः परन्तप ॥२॥
Sanskrit
evaṁ paramparā-prāptam imaṁ rājarṣayo viduḥ sa kāleneha mahatā yogo naṣṭaḥ parantapa
Translation
This supreme science was thus received through the chain of disciplic succession, and the saintly kings understood it in that way. But in course of time the succession was broken, and therefore the science as it is appears to be lost.