I love these quotes from 'The Seven Habits of Highly Effective People' by Stephen Covey:
Listen with the intent to understand, not the intent to reply.
Trust is the glue of life. It's the most essential ingredient in effective communication. It's the foundational principle that holds all relationships.
To learn something but not to do is really not to learn. To know something but not to do is really not to know.
Effective leadership is putting first things first. Effective management is discipline, carrying it out.
There are three constants in life... change, choice and principles.