" One of the conflicts inherent in having choice is that we all make different ones. There is always an opportunity cost, and I don't know any woman who feels comfortable with all her decisions. As a result, we inadvertently hold that discomfort against those who remind us of the path not taken. Guilt and insecurity make us second-guess ourselves and, in turn, resent one another.' "

― Sheryl Sandberg , Lean In: Women, Work, and the Will to Lead