Śrīmad-Bhāgavatam · Text 4.21.35
Who is speaking and story frame
प्रधानकालाशयधर्मसङ्ग्रहे
शरीर एष प्रतिपद्य चेतनाम् ।
क्रियाफलत्वेन विभुर्विभाव्यते
यथानलो दारुषु तद्गुणात्मक: ॥ ३५ ॥
pradhāna-kālāśaya-dharma-saṅgrahe
śarīra eṣa pratipadya cetanām
kriyā-phalatvena vibhur vibhāvyate
yathānalo dāruṣu tad-guṇātmakaḥ
The Supreme Personality of Godhead is all-pervading, but He is also manifested in different types of bodies which arise from a combination of material nature, time, desires and occupational duties. Thus different types of consciousness develop, just as fire, which is always basically the same, blazes in different ways according to the shape and dimension of firewood.
Read Śrīla Prabhupāda's purport on Vedabase.io