The Supreme Brahman, Kṛṣṇa, is the ultimate resting place and source of everything. Everything is done by Him, everything belongs to Him, and everything is offered to Him. He is the ultimate objective, and whether acting or causing others to act, He is the ultimate doer. There are many causes, high and low, but since He is the cause of all causes, He is well known as the Supreme Brahman who existed before all activities. He is one without a second and has no other cause. I therefore offer my respects unto Him.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
यस्मिन् यतो येन च यस्य यस्मै यद्यो यथा कुरुते कार्यते च । परावरेषां परमं प्राक्प्रसिद्धं तद्ब्रह्म तद्धेतुरनन्यदेकम्
yasmin yato yena ca yasya yasmai yadyo yathā kurute kāryate ca | parāvareṣāṃ paramaṃ prākprasiddhaṃ tadbrahma taddheturananyadekam
SB 6.4.30