I think personal development and professional development works together. We are just one person.
So may these 50 quotes inspire you both on a professional and personal levels.
http://www.marcandangel.com/2013/04/18/50-quotes-that-will-free-your-mind/

Michel Dion, PMP, CPA
Founder and Developer of Project-Aria
Discover my book:
Leadership Toolbox for Project Managers: Achieve Better Results in a Dynamic World