5. It's okay to be emotional

In many situations in life, it's okay to be emotional: when you watch a good movie, when you hang around with friends, when you meet new people, etc.

But when it comes to your career or your business venture, it's time to become Mr. Spock!

In other words, you should be ruthlessly rational when making business decisions.

(Here, many people might argue that career decisions can be emotional, based on one's passion. I would argue that a career CHOICE can be emotional, since that's when you decide which field to get into, and this obviously has to do with your interests and passions. But a career DECISION must be rational. A choice is about doing the right things, a decision is about doing things right.)

Here's a tip to "enforce" rationality in your business thinking and behavior: make your business information, data, plans, decisions, etc. as public as possible. In other words, share the info with people you trust. Get their blunt feedback (tell them you don't want polite feedback, which is useless; you want the truth, so you can improve).