The arhat completes the path.
Liberation is won individually — the noble person who has done what needed doing.
The arhat — one who has ended the defilements and will not be reborn — is Theravada's completed human being, and the Mahayana critique that this is a lesser, self-interested goal is the oldest live argument in Buddhism. The Theravada reply is that an arhat is by definition free of self-interest, so the charge misdescribes the attainment. The disagreement is genuinely about what liberation is for, and neither side has conceded in two thousand years.
The same ground, other faiths
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