why honesty leads to greater bonding

Is this a blinding flash of the obvious or what? (Yes, I too am a fan of Dilbert!)

The more honest you are in any relationship; the more you open up to someone and share your opinions, hopes, dreams, ambitions, fears.... the more vulnerable you make yourself. It is the awareness of the fact that someone has lowered their defenses/shields and trusted you with their secrets, that leads to a greater bonding..... and ultimately an excellent relationship based on mutual trust.