be convinced of

I am pretty sure no one needs to be convinced of how important — how much a part of the culture — iced tea, sweet tea specifically, is in the South.

Tim Stockwell, a scientist at the Canadian Institute for Substance Use Research, is one of the people most responsible for our cultural course correction on alcohol, a credit that’s all the more notable since he used to be convinced of its health benefits.

The coalition’s leaders selected him 15 days after he returned from vacation, and he accepted under a few conditions, including that his wife be convinced of the decision.

If crop production is actually to embrace this digital revolution, however, the people who will actually be putting it into action -- the farmers -- will also need to be convinced of its benefits.

I have watched enough testimonials — more than 10 — to be convinced of its effectiveness.