kāraṇabhedena hi bhāvānāṃ svabhāvabhedapratiniyamān na śakyate kvacid ekadā dṛṣṭasya vastunaḥ sarvatra sarvadā tathā bhāvo niścetum
Due to the diversity of causes, the nature of things varies and becomes restricted; therefore it is not possible to determine that an object once seen somewhere will retain the same nature everywhere and at all times.