Here’s some deep wisdom from Milton Glaser, who says, "I am going to tell you everything that I know about the practice of design. It is a sort of collage of bits and pieces that I have assembled over 50 years…This is what I’ve learned."  You’ll need at least an hour to soak all of this in.  Here’s an overview:

1. You can only work for people that you like
2. If you have a choice never have a job
3. Some people are toxic; avoid them
4. The good is the enemy of the great
5. Less is not necessarily more
6. Style is not to be trusted
7. How you live changes your brain
8. Doubt is better than certainty
9. Solving the problem is more important than being right
10. Tell the truth

I particularly like no. 5:  "Just enough is more". 

via Seth Godin