Full context:   Innate qualities and tendencies are key ancient concepts in Indian literature. Maitrayaniya Upanishad is one of the earliest texts making an explicit reference to Hindu trinity of Brahma, Vishnu and Shiva and linking them to their Guna – as creator/activity, preserver/purity, destroyer/recycler respectively. The idea of three types of guṇa, innate nature and forces that together transform and keep changing the world is, however, found in numerous earlier and later Indian texts.