The law of cause and effect is a natural law. Buddha Sakyamuni did not pronounce it, nor did he create it; the Buddha only discovered it and promulgated it to all people.
As stated in the Rice Seedling Sutra: “With or without the Tatagatha, the essence of phenomena abides.” Whether the Buddha appears or not in this world, the natural law of phenomena exists and does not change.
~Depicted from ARE YOU READY FOR HAPPINESSS - Spiritual Equipment for Modern Times