The purpose of why the Buddhas, the World-Honored Ones. appearing in the world

The Buddhas, the World-Honored Ones, wish to open the door of Buddha wisdom to all living beings, to allow them to attain purity. That is why they appear in the world. They wish to show the Buddha wisdom to living beings, and therefore they appear in the world. They wish to cause living beings to awaken to the Buddha wisdom, and therefore they appear in the world. They wish to induce living beings to enter the path of Buddha wisdom, and therefore they appear in the world. -The Lotus Sutra

Wisdom for Modern Life by Daisaku Ikeda 24/4