In no particular order, Daring Greatly by Dr. Brene Brown, Self Compassion by Dr. Kristen Neff, and Love Sense by Dr. Sue Johnson.

I look at the world, others, my wife, my children and myself differently because of these books. All of them are grounded in solid research. I even teach a workshop for couples based on the principles of Love Sense because it had such a profound effect on me and my marriage.