ऋषिभिर्बहुधा गीतं छन्दोभिर्विविधैः पृथक्।
ब्रह्मसूत्रपदैश्चैव हेतुमद्भिर्विनिश्िचतैः।।13.5।।
13.5. This has been sung many times by sages, and also has been clearly decided in the various Vedas in different contexts by means of [their] words that are suggestive of the Brahman (i.e. in the Upanisads) and are full of reasoning.
13.4-5 Tat Ksetram etc. Rsibhih etc. Why it modifies : due to what this [Field] suffers modification. Collectively : not at all separately (one by one). [The Bhagavat] decides all the estions in a general way. Of course, many a time in many a way this has been declared by the seers and by the scritpures. But, let Me (the Bhagavat) explain this collectively (briefly).
Rishibhirbahudhaa geetam cchandobhirvividhaih prithak; Brahmasootrapadaishchaiva hetumadbhirvinishchitaih.
ṛiṣhibhiḥ—by great sages; bahudhā—in manifold ways; gītam—sung; chhandobhiḥ—in Vedic hymns; vividhaiḥ—various; pṛithak—variously; brahma-sūtra—the Brahma Sūtra; padaiḥ—by the hymns; cha—and; eva—especially; hetu-madbhiḥ—with logic; viniśhchitaiḥ—conclusive evidence
