Sir Lal: “Suicide done with proper understanding is a different case. There is an account in the Tipitaka about an Arahant who took his life with the approval of the Buddha. Arahants live only for the benefit of others, to explain Dhamma to others. If the Arahant is in deep pain due to an unrecoverable illness, there is no point in living and undergoing such pain.”
My response: It was the venerable Vakkali sir VAKKALI SUTTA: DISCOURSE TO VENERABLE VAKKALI