This Sunday's Gospel begins with the question that a lawyer asks Jesus: "Teacher, what shall I do to inherit eternal life?" (Lk 10: 25). Knowing him to be expert in Sacred Scripture, the Lord asks this man to give the reply himself; indeed, he formulates it perfectly, citing the two main commandments: you shall love the Lord your God, with all your heart, and with all your mind and with all your strength, and love your neighbour as yourself. Then the lawyer, as if to justify himself, asks: "And who is my neighbour?" (Lk 10: 29). This time, Jesus answers with the famous words of the "Good Samaritan" (cf. Lk 10: 30-37) in order to show that it is up to us to make ourselves the neighbour of all who are in need of help. In fact, the Samaritan takes charge of the condition of a stranger whom robbers have left half dead on the wayside; while a priest and a Levite had passed him by, perhaps thinking, on account of a precept, that they would be contaminated by the contact with blood. The Parable must therefore induce us to change our mindset in accordance with the logic of Christ, which is the logic of charity: God is love, and worshipping him means serving our brethren with sincere and generous love.
This Gospel account offers the "standard", that is, "universal love towards the needy whom we encounter "by chance' (cf. Lk 10: 31), whoever they may be" (Encyclical Deus Caritas Est, n. 25). Besides this universal rule there is also a specifically ecclesial requirement: that "in the Church herself, as family, no member should suffer because he is in need" (ibid.). The Christian's programme, learned from Jesus' teaching, is "a heart which sees" where there is a need for love, and acts accordingly (cf. ibid., n. 31).
[Pope Benedict, Angelus, 11 July 2010]