[True]

He limped UTG, please be serious, this guy has a worse hand than you hardly ever unless he has a club flush draw and then you are getting a free card a lot of the time anyway.

Against this opponent, definitely check.

And this :

"only good things can happen when you bet and only bad things can happen when you check"

This is completely wrong, if you bet you can get raised, if you check you can get a free card. You may get called by a bad hand, or if you check have to put in a bet that he would have just called anyway (e.g. only 1 bet) but having to ONLY pay one bet or no bets is far superior to having to pay at least one and possibly 2.

People here are saying "bet it's for value" well the thing is that he won't call with 78 again, he can't hit runner clubs anymore or runner straight. If he does have 78 he will often check/ check but the 7 of hearts may come down and you will win a bet from him when he would have folded.

True