Honesty requires more than just abstaining from speaking something that is false. Honesty is the state of reconciliation between what you think, feel, and do to the truth as far as you understand it.
Honesty is more important than you think. Honesty is a prerequisite to generating daily and lifelong happiness. Only through honesty can you see who you really are, who you really could be, and how and why to attain your potential.
Most people are dishonest, and the consequences of this are far worse and more widespread than normal people realize. Dishonesty blinds you to who you are and blocks you from who you could become. To the extent you deviate from full, integral honesty, you will fail to obtain what you hope for and desire in life. Dishonesty will blind you to how things really are, consistently frustrating your ability to obtain what you desire and continually presenting you with problems in life that you can't adequately address.
The most important benefit of living an honest life is the relationship with God it enables you to attain. God is the fulfillment of the potential of man, and as honesty opens your eyes to who you really are and could be, you will learn more about how God is, how to become more like him, and why you should.
Honesty is the aperture of good that flows into your life. As you become more honest, you will increase in who you become, what you accomplish, and the amount of meaning and joy you experience while doing so.