All the bodhisattvas tried in vain to attain Buddhahood during the first 40 years or so of the Buddha’s preaching, beginning with the Flower Garland Sūtra, Therefore when the “concise replacement of the Three Vehicles with the One Vehicle” doctrine was preached in the “Expedients” chapter of the Lotus Sūtra, “80,000 bodhisattvas who wished to become Buddhas as well as the Wheel-turning Noble Kings gathered from tens of thousands and millions of lands pressed their palms together in the form of gasshō to show respect to the Buddha, wishing to hear the perfect way.” Thereupon the Buddha expounded the “expanded replacement of the Three Vehicles with the One Vehicle” doctrine. “Listening to this doctrine, those bodhisattvas’ doubts all melted away,” says the sūtra.
Kitō Shō, Treatise on Prayers