Allan Kardec. The book of spirits (№ 397685)

It was a clash with the selfishness of other people makes a person and very selfish, because he should be ready to resist. Seeing what others think about themselves, not about him, it comes to having to deal with them more than others. Let the principle of charity and fraternity become the basis of public policy, let the relationship of nation to nation and human to human based on the spirit of law - and people will think less of the person when you see what others thought about him; he will experience the moralizing influence of example and contact. In the face of such rampant selfishness, as now, hath need of true virtue, in order to renounce his self for others, which often without any gratitude.