Shariputra chimes in with his doubts about the dragon girl, almost scoffing, saying in effect, Who do you think you are so presumptuous to come here and claim to be able to become a Buddha so rapidly? The arrogance of the intellectual can be most harmful when we let our brain control our heart. Shariputra offers up the traditionally held objections to a woman becoming a king, which also transferred to beliefs about women becoming Buddhas. Those five objections are called the five impossibilities and are: a woman cannot become a Brahman-Heavenly-King, a King Sakra, a King Mara, a wheel-turning-holy-king, or a Buddha.
Lecture on the Lotus Sutra