Śrīmad-Bhāgavatam · Text 11.9.25
Who is speaking and story frame
देहो गुरुर्मम विरक्तिविवेकहेतु-
र्बिभ्रत् स्म सत्त्वनिधनं सततार्त्युदर्कम् ।
तत्त्वान्यनेन विमृशामि यथा तथापि
पारक्यमित्यवसितो विचराम्यसङ्ग: ॥ २५ ॥
deho gurur mama virakti-viveka-hetur
bibhrat sma sattva-nidhanaṁ satatārty-udarkam
tattvāny anena vimṛśāmi yathā tathāpi
pārakyam ity avasito vicarāmy asaṅgaḥ
The material body is also my spiritual master because it teaches me detachment. Being subject to creation and destruction, it always comes to a painful end. Thus, although using my body to acquire knowledge, I always remember that it will ultimately be consumed by others, and remaining detached, I move about this world.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.