If you go the "Quotes" section up top, you can sort the quotes on this site by "Best quotes" -- the ones the people like the most. From there, you can look at what features of quotes people actually like.

Some examples are: short quotes, minimal punctuation, easy words, quotes by famous people, etc.

Also, inb4 someone sarcastically mentions Grey's Anatomy.

If you want to follow me around for a day with a voice recorder, I will let you. Everything that comes out of my mouth is gold, so should make for good keyhero quotes.

Start by not writing them yourself.

Just do it. You always said you'll do it tomorrow, well, today is as good as any other day, so do it. What are you waiting for? Take that opportunity and don't let it slip away: do it! There will come a day when you will look back at this day and ask yourself "why didn't I act sooner, what was I afraid of?" On that day you would have already waited for too long, but even then you should finally realize that you should just do it. Do it! Do it now, or don't think of doing it ever again. Just do it!

Keep them not too personal and controversial. People want to type not to get lessons about life, honestly half of them sound like some disturbed propaganda.

This. I want to delete the quotes I added when I was younger.