Trying to think of startup ideas doesn't merely yield few good ideas; it yields bad ideas that sound plausible enough to fool you into working on them.

Your time is better spent championing good ideas than tearing down bad ones.

The best thing that can happen to a bad idea is that it is forgotten. The best thing that can happen to a good idea is that it is shared.

Feed the good ideas and let bad ideas die of starvation.

Good ideas can go bad because they’re made for the wrong reasons. The mission isn’t the right mission. Even though all the players may be noble players, the mission itself is fundamentally flawed.

A multitude of bad ideas is necessary for one good idea.

For every good idea, expect to have five, ten, twenty wrong or useless ideas. You cannot avoid the bad ideas if you keep your imagination free. There is no spam filter for bad ideas.

It's not the bad ideas that do you in, it’s the good ideas. And you may say, 'That can't be so. That's paradoxical. What he [Graham] meant was that if a thing is a bad idea, it’s hard to overdo. But where there is a good idea with a core of essential and important truth, you can’t ignore it. And then it's so easy to overdo it. So the good ideas are a wonderful way to suffer terribly if you overdo them

Nothing dies harder than a bad idea. And few ideas are worse than the ones we have about art.

The biggest secret I've learned about creating billion-dollar companies is that the best ideas look like bad ideas at first. If everyone agrees with you, you’re too late.

Great companies and great businesses often seem to be bad ideas when they first appear because business model innovations — by their very definition — can’t point to a proven business model to demonstrate why they’ll work.

Bad ideas don’t die simply because they are intrinsically bad. You need people who will stand up and fight them, put themselves at risk, point out the weaknesses, and drive stakes through their hearts.

Bad ideas in computer science and anywhere are sticky. If the first idea was a bad idea, then because it works people will sort of repeat it.

I have lots of ideas. Trouble is, most of them suck.

The biggest secret in building a billion-dollar company is that the best ideas look like bad ideas at first. If everyone agrees with you, you’re too late.

You may turn a bad idea into a good idea — don't kill the bad idea prematurely. A bad idea can evolve into a good idea.