Frank Walker, the modern critic who made the English-speaking world appreciate the importance of Boito, paid him this tribute:
It was fortunate for us, and for Verdi, that among the younger generation there was this companion, so subtly intelligent, so unselfishly devoted. The more one learns of Boito the more he appears one of the noblest and purest spirits of the whole romantic movement.
Verdi knew what Boito had done for him. After the successful premiere of Otello, and then again after that of Falstaff, he led Boito out with him to take the multiple curtain calls they had earned together.