CC Madhya 24.189
mattaḥ sarvaṁ pravartate
iti matvā bhajante māṁ
aham — I, Lord Kṛṣṇa; sarvasya — of everyone; prabhavaḥ — the original source; mattaḥ — from Me; sarvam — everything; pravartate — emanates; iti — thus; matvā — understanding; bhajante — they engage in devotional service; mām — to Me; budhāḥ — those who are learned; bhāva-samanvitāḥ — with love and devotion.
“ ‘I [Kṛṣṇa] am the original source of everything. Everything emanates from Me. The wise who perfectly know this engage in My service with love and devotion.’
This is a quotation from the Bhagavad-gītā (10.8).