My wife gave it the strictest possible interpretation as a loophole for all the restrictions and duties in the Bible on what a person may/must and may not/must not do, think, say and feel emotionally. She followed those every second of her life and everyone figured she would become a minister's wife. That prospect terrified her because then she would be under minister's wife rules the rest of her life. So she explored how to spiritual grow beyond child-like spirituality within the Bible, ie "when I became an adult I put away childish things.'
To her that verse means anything I allow can not be sinful or prohibited regardless of what the Bible otherwise says because I have taken all sin liability onto myself, like Jesus took the sin liability of everyone onto himself. In this, she was on a quest for a man that is never abusive and always protective and respectful towards women and children, but otherwise has no sense that anything is sinful or wrong, rather to do or not do whatever he wanted he could and could get away with and didn't care what others did. No man ever met was of any interest to her including because he would have rules she had to restrain herself to. And then by a fluke she came across me, for which she decided that same night it was me or nobody.
Simply, any restraints on her are only those I set and any liberty is what I allow as her husband. When I came to understand her opinion on this from her 1 1/2 page single spaced, wide margin marriage vows, I told her my rules for her are that she may do anything she wants and not do anything she doesn't - no exceptions of any kind - nor need she ask permission because she already has it for anything and everything. My rule is that nothing she does is wrong or bad. Nothing she does or doesn't do is even possibly an offense against me or breaking my rules. Doing what she wants to do is following my rules. If she needed a command from me, my command is that no matter what she does or does not do in thought, word, deed or emotion she is never to feel guilt because there is none.
Thus, by marrying the least restrictive husband and totally submitting to him she gained total freedom from being capable of committing a sin. Since a husband has the same authority over her as Christ has over the church my authority is equally absolute. Nothing Jesus allows you to do is sinful, nor is anything Jesus does sinful - at least not in relation to her because Jesus is infallible. Curious perspective.
Makes for a very interesting marriage. Challenging too. While some men might think "GREAT!" - I suspect most men really wouldn't like this because they would not really mean anything and everything. I really do. She's delightful. Pure heart and innocent mind no matter what she does.