The most powerful sign is that your work no longer enchants you - it's not deep, delightful, and mutually satisfying. When this happens, it may be time to look for new challenges.
Guy KawasakiRevolutionary products don't fail because they are shipped too early. They fail because they aren't revised fast enough.
Guy KawasakiThere was no "decision" per se to re-position myself. I simply decided that I wanted to write a book that would help people influence others.
Guy Kawasaki