The Laṅkāvatāra Sūtra is a Buddhist scripture, which means it contains teachings of the Buddha. It's goal is to help people learn how to become enlightened, which means to understand the true nature of the world and ourselves. In this sutta, the Buddha explains how the world works and how to reach a state of enlightenment. He describes the interconnectedness of everything and the importance of acting with compassion and wisdom. He explains how to attain liberation from suffering and cycle of rebirth, as well as how to awaken one's own true nature. In simple terms, the Laṅkāvatāra Sūtra is a guide to help us understand life and how to be happy and at peace.