When venerable Sāriputta meets venerable Puṇṇa Mantāṇiputta, he asks whether the spiritual life is lived for the sake of various purifications—of conduct, mind, view, overcoming doubt, knowing the path, knowing the practice, and knowledge and vision. Venerable Mantāṇiputta explains, with the simile of seven relay chariots, that each stage of purification serves only as a step toward the next, culminating in final Nibbāna without clinging—the true goal of the spiritual life.