From a Buddhist sutra on the timeless truth of the Buddha:
The Buddha once said, 'Monks, the lion, king of beasts, at eventide comes forth from his lair. He stretches himself. Having done so, he surveys the four quarters in all directions. Have done that, he utters thrice his lion's roar. Having thrice uttered his lion's roar, he sallies forth in search of prey.
'Now, monks, whatever animals hear the sound of the roaring of the lion, king of beasts, for the most part, they are afraid; they fall to quaking and trembling. Those that dwell in holes seek them; water-dwellers make for the water; forest-dwellers enter the forest; birds mount into the air.
'Then whatsoever ruler's elephants in village, town or palace are tethered with stout leather bonds, they burst out and rend those bonds asunder; void their excrements and in panic run to and fro. Thus potent, is the lion, king of beasts, over animals. Of such mighty power and
majesty is he.
'Just so, monks, is it when a Buddha arises in the world, an Arahant, a Perfectly Enlightened One, perfect in wisdom and in conduct, wayfarer, Knower of the worlds, the unsurpassed trainer of those who can be trained, teacher of gods and men, a Buddha, an Exalted One. He teaches the Dhamma; "Such is the nature of concept of Self; this is the way leading to the ending of such a Self.'
'Whatsoever gods there be, they too, on hearing the Dhamma of the Tathagata, for the most part are afraid: they fall to quaking and trembling, saying: 'We who thought ourselves permanent are after all impermanent: that we who thought ourselves stable are after all unstable: not to last, though lasting we thought ourselves. So it seems that we are impermanent, unstable, not to last, compassed about with a Self.' Thus potent is a Tathagata over the world of gods and men. (Anguttara Nikaya).