He later indicated that he was prepared to give the new President six months to prove his sincerity.

By telling the truth this time, she would prove her sincerity.

And I am proving my sincerity with this last act.

You and your crew have more than proven your sincerity.

And what about the agents Blake had been allowed to betray in order to prove his sincerity?

To prove her sincerity, Menolly backtracked to the far end of the beach.

There must be a way you can prove your sincerity .

"But I do," he said, looking straight into her eyes as though that proved his sincerity.

"As a minority we feel a need to prove our sincerity," he said.

Shall I have one of them slain to prove my sincerity?