2 God's love for us is fundamental for our lives, and it raises important questions about who God is and who we are. In considering this, we immediately find ourselves hampered by a problem of language. Today, the term “love” has become one of the most frequently used and misused of words, a word to which we attach quite different meanings. Even though this Encyclical will deal primarily with the understanding and practice of love in sacred Scripture and in the Church's Tradition, we cannot simply prescind from the meaning of the word in the different cultures and in present-day usage. Let us first of all bring to mind the vast semantic range of the word “love”: we speak of love of country, love of one's profession, love between friends, love of work, love between parents and children, love between family members, love of neighbour and love of God. Amid this multiplicity of meanings, however, one in particular stands out: love between man and woman, where body and soul are inseparably joined and human beings glimpse an apparently irresistible promise of happiness. This would seem to be the very epitome of love; all other kinds of love immediately seem to fade in comparison. So we need to ask: are all these forms of love basically one, so that love, in its many and varied manifestations, is ultimately a single reality, or are we merely using the same word to designate totally different realities?
Source: Deus Caritas Est (Vatican.va)