On the abiding character of love.
And why do you wonder that those duties enumerated above will cease, when the holy Apostle tells us that even the higher gifts of the Holy Spirit will pass away: and points out that charity alone will abide without end, saying “whether there be prophecies, they shall fail; whether there be tongues, they shall cease: whether there be knowledge, it will come to an end,” but of this he says “Charity never fails.” For all gifts are given for a time as use and need require, but when the dispensation is ended they will without doubt presently pass away: but love will never be destroyed. For not only does it work usefully in us in this world; but also in that to come, when the burden of bodily needs is cast off, it will continue in far greater vigour and excellence, and will never be weakened by any defect, but by means of its perpetual incorruption will cling to God more intently and earnestly.
Source: Conferences (New Advent)