Richelle E. Goodrich said this quote

“ Many of us draw lines which we intend never to cross. But life tests our resolve, mercilessly at times, and a foot budges, nudged past that thinly-drawn line. So we draw another, resolving never to cross this one. Days grow dark and fog creeps in to blind our view, clouding the reason for the line’s existence from our minds. We draw another mark, ashamed that the last was crossed with less coaxing than we imagined it would require. Shadows and doubts give further need to draw a new line, and then another and another. Lines, I think, are too slim and obscure to be dependable deterrents for behavior. Too often, too easily, people stumble into places they later regret entering. What, then, keeps some individuals from crossing those narrow lines?It is the power of values. For if a person possessing values were to step one foot outside their line, they would be forced to release hands with those inflexible values and consciously abandon them. But their values are persuasive, keeping a tight grip, warding off the luring temptations beckoning one to test the line. Thus values maintained keep a person safely away from areas they dare not travel, steering a life between the lines, enhancing willpower and shaping mighty strength of character. ”