What 80s show does 'and knowing is half the battle' come from?

Back in the ‘80s, TV liked to teach kids stuff about life. BOOORRRING!

But, if you were paying attention it will help you answer this trivia question.

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80s TV shows

What show is this line from? 

"And knowing is half the battle."

Cobra took over the world.

You failed the American people.

You watched too much TV in the 80s. Good job.

And that's half the battle! Wow, it starts sounding weird when you repeat it too many times.