Steve: 
Looking back I've always battled with some particular toxic piece of my headspace. When I was younger it was perfectionism. After starting to build my business, that perfectionism turned to anger and cynicism. It's my 'dark side'. First it was aimed at myself, then at others. But what I've realized recently is that it doesn't have to take over. You have the power to stop it when it starts to seep in. Sometimes it's easy and sometimes it takes everything in you to take control of it. But it is possible. It requires self awareness, discipline, and patients, but it can be done.