BG 7.24

The less intelligent think that I, the Supreme Lord Shree Krishna, was formless earlier and have now assumed this personality. They do not understand the imperishable exalted nature of My personal form.

BG 12.1

Arjun inquired: Between those who are steadfastly devoted to Your personal form and those who worship the formless Brahman, whom do You consider to be more perfect in Yog?

BG 12.3-4

But those who worship the formless aspect of the Absolute Truth—the imperishable, the indefinable, the unmanifest, the all-pervading, the unthinkable, the unchanging, the eternal, and the immoveable—by restraining their senses and being even-minded everywhere, such persons, engaged in the welfare of all beings, also attain Me.

BG 13.6

The field of activities is composed of the five great elements, the ego, the intellect, the unmanifest primordial matter, the eleven senses (five knowledge senses, five working senses, and mind), and the five objects of the senses.