And now these three remain: faith, hope and love. But the greatest of these is love.

 1 Corinthians 13:1-13

If I speak in the tongues of men or of angels, but do not have love, I am only a resounding gong or a clanging cymbal. If I have the gift of prophecy and can fathom all mysteries and all knowledge, and if I have a faith that can move mountains, but do not have love, I am nothing.

Love is patient, love is kind. It does not envy, it does not boast, it is not proud. It does not dishonor others, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. Love does not delight in evil but rejoices with the truth. It always protects, always trusts, always hopes, always perseveres.

Love never fails. But where there are prophecies, they will cease; where there are tongues, they will be stilled; where there is knowledge, it will pass away. For we know in part and we prophesy in part, but when completeness comes, what is in part disappears.

And now these three remain: faith, hope and love. But the greatest of these is love.

Why? 

Faith, hope, and love remain, but the greatest is love; without love, any others are nothing.

Prophecies will cease, tongues will be stilled, knowledge will pass away, when completeness comes, what is in part disappears. All we know in this world is part of completeness.

How?

The Lord stands forever, God's words endure forever, and love makes efforts valuable.