"I may be mistaken, but it seems to me that . . ."
"We are all subject to correction, but as far as we know . . ."
"In this necessarily imperfect world . . ."
"So far as one is able to judge . . ."
"Appearances are notoriously deceptive, but . . ."
"Human experience is necessarily limited to . . ."
"We can never be really sure . . ."
"Pilate asked, 'What is truth?' Ah, my brethren, what indeed?"
"The best minds of the country have failed to come to an agreement on this question; one can only surmise . . ."
"Art is long and life is short. Art to-day is even longer than it used to be."