ṛṣibhir bahudhā gītaṁ
chandobhir vividhaiḥ pṛthak
ṛṣibhiḥ — by the wise sages; bahudhā — in many ways; gītam — described; chandobhiḥ — by Vedic hymns; vividhaiḥ — various; pṛthak — variously; brahma-sūtra — of the Vedānta; padaiḥ — by the aphorisms; ca — also; eva — certainly; hetu-madbhiḥ — with cause and effect; viniścitaiḥ — certain.
That knowledge of the field of activities and of the knower of activities is described by various sages in various Vedic writings. It is especially presented in Vedānta-sūtra with all reasoning as to cause and effect.
. . .
ऋषिभिर्बहुधा गीतं छन्दोभिर्विविधै: पृथक् ।
ब्रह्मसूत्रपदैश्चैव हेतुमद्भिर्विनिश्चितै: ॥ ५ ॥