A common good is a good in which several persons can share without diminishing it. Children are a common good of their parents and of the whole family. When some of the children are already older and a new one comes home from the hospital, a circle forms around this new center. The baby sleeps much after the effort of birth. In addition, it cannot speak. And yet its presence radiates. Everyone in the circle suns itself in this presence.
That love is needed for moral discernment is a central thesis in Livio Melina’s paper. An old Latin proverb says, Ubi amor, ibi oculus – where love is, there is the eye. According to St. Thomas, the rightness of judgment can come to be in two ways: in one way, following the complete use of reason, in another way, because of a certain kinship (connaturalitas) with what one must judge at present. And this connaturality or kinship itself comes to be through love.