Verse
ऋषिभिर्बहुधा गीतं छन्दोभिर्विविधैः पृथक् ।ब्रह्मसूत्रपदैश्चैव हेतुमद्भिर्विनिश्चितैः ॥
It has been sung by the Rishis in manifold ways in various inspired verses; and also by the Brahma Sutras which give us the rational and philosophic analysis.
Gītā 13·5