Succumbing to temptations, does this makes us more human?   

I have always wondered at the idea of what makes us persons more like human beings. Does having all the physiological signs of our developmental age or the idea of succumbing to to fleshy temptations make us more human? I have always heard people who committed mistakes and who were able to realize their mistakes to rationalize that they did such mistake becasue they are just human beings? Is this reason enough to make a person more like human? To you, do u think succumbing to temptations make you more human?