Hell isn't merely paved with good intentions; it's walled and roofed with them. Yes, and furnished too.

Hell is paved with good intentions.

The Senate is a place filled with goodwill and good intentions, and if the road to hell is paved with them, then it's a pretty good detour.

There are people who do what they believe is right, but as they say, 'The road to hell is paved with good intentions.'

Hell is paved with good intentions, not bad ones

And good intentions? These scared him the most: people with good intentions tended not to question themselves. And people who didn't question themselves, in the scientific world and beyond, were the ones to watch out for.