Note 21 — Chapter XVI · ON TO MATHURA OR MUTTRA. CONDITION AND CUSTOMS OF CENTRAL INDIA; OF THE MONKS, VIHARAS, AND MONASTERIES.
James Legge translation
(21) There are six (sometimes increased to ten) paramitas, “means of passing to nirvâna:—Charity; morality; patience; energy; tranquil contemplation; wisdom (prajna); made up to ten by use of the proper means; science; pious vows; and force of purpose. But it is only prajna which carries men across the samsara to the shores of nirvâna.” Eitel, p. 90.