De la réciprocité amoureuse

From St Paul's Letter to the Romans
 (12:1-2, 9-18. Love each other with mutual affection)  

I appeal to you therefore, brothers and sisters, by the mercies of God, to present your bodies as a living sacrifice, holy and acceptable to God, which is your spiritual worship.  Do not be conformed to this world, but be transformed by the renewing of your minds, so that you may discern what is the will of God—what is good and acceptable and perfect.

Let love be genuine; hate what is evil, hold fast to what is good;  love one another with mutual affection; outdo one another in showing honor.  Do not lag in zeal, be ardent in spirit, serve the Lord.  Rejoice in hope, be patient in suffering, persevere in prayer.  Contribute to the needs of the saints; extend hospitality to strangers.  Bless those who persecute you; bless and do not curse them.  Rejoice with those who rejoice, weep with those who weep.  Live in harmony with one another; do not be haughty, but associate with the lowly; do not claim to be wiser than you are.  Do not repay anyone evil for evil, but take thought for what is noble in the sight of all.  If it is possible, so far as it depends on you, live peaceably with all.