Bhagavatapurana 3.12.49

3.12.49

tato 'parām upādāya sa sargāya mano dadhe /
ṛṣīṇāṃ bhūri-vīryāṇām api sargam avistṛtam //

49 & 50. Then Brahma assumed a different body and thought of proceeding with the creation. Seeing that also the creation of Rishis possessed of great virtue was not sufficiently extensive, He began, O Vidura, to think over it again in His mind: "It is really a wonder that though I am busy every day, living beings do not increase; perhaps the Providence is interrupting it."