Vasiṣṭha's teaching (Mahārāmāyaṇa) 7.208.26

7.208.26

na saṃkalpayitā rājansaṃkalpanagare svayam .
tṛṇaṃ tṛṇaṃ kalpayati bālaḥ krīḍanakāniva .. 26

26. [Sanskrit available] But God neither wills nor does everything himself, in this creation of his will, but he acts by general laws and secondary causes, as in the cricket play of boys, and growth of grass from grass, and production of trees and their fruits &c. from seeds.