Honesty
Here's another of my favorite quotes from L. Ron Hubbard:
“Freedom is for honest people. No man who is not himself honest can be free – he is his own trap.”
I remember a friend who was cheating on her boyfriend(s). She actually had two "steady" boyfriends who both thought they were the only one. She thought this was a lark, and just had a great time with it, but I saw her get into more trouble that year - and she never associated it with what she was doing.
She got into drugs, she "realized" that the dream she had to be a ballet dancer "wasn't realistic" because "she was too short" (yet she never agreed to this before she started fooling around), and in the end both relationships became hurtful, vicious relationships which upset her terribly.
She always thought she got away with cheating on these guys. But none of these things happened before she did this....