And though I have the gift of prophecy, and understand all mysteries and all knowledge, and though I have all faith, so that I could remove mountains, but have not love, I am nothing.
And though I bestow all my goods to feed the poor, and though I give my body to be burned, but have not love, it profits me nothing."
1 Corinthians 13:1-3 (NKJV)
There are some things that are considered so necessary that they are often called a "must have", something you can't do without. These are things that are absolutely essential to the situation. For example, if you are interested in traveling to another country you must have a passport, without a passport you are not even allowed to leave your country. Another example would be having fuel in your car. You can have the nicest, newest car around but if you don't have the necessary fuel your car will not move. Or you could have the latest telephone with the latest technology, but without a network connection it is useless.
In 1 Corinthians 13 Paul talked about something that is a must have for success in the life of a believer, love in everything we say and do. When Paul wrote about love, he was not talking about what most people commonly refer to as love, Paul was writing about the love of God, not some emotion. In Romans 5:5 we learn that the love of God is in us and because of this we can, and should, operate in God's love. Anything that we do or say that is outside of the love of God will not really benefit us, or anyone else. No matter what we do, if we do it outside of love it will not have the results it should have.
Paul talked about having the ability to speak the most wonderful words, but without love it would all be just noise. Paul said we could have knowledge, understanding, and faith, but without love it would still amount to nothing. Paul also told us how we could do the greatest acts of kindness and charity, but without love there is no benefit to us. There are many things that we can do that are good, but without the right motive behind it, without love, those things would mean nothing. Love is something that is "must have" for Christians, it is essential for everything that we say and do.