The origin of Valentine's Day is really the celebration of the sacrifices and martyrdom of a number of early Christians named Valentine. I think this is a better lens to view Love then the current "I love you" cards and candies (I still participate in those too, I want to stay married). So while celebrating this day keep in mind...
1 Corinthians 13:4-13
4Love is patient, love is kind. It does not envy, it does not boast, it is not proud. 5It is not rude, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. 6Love does not delight in evil but rejoices with the truth. 7It always protects, always trusts, always hopes, always perseveres.
8Love 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. 9For we know in part and we prophesy in part, 10but when perfection comes, the imperfect disappears. 11When I was a child, I talked like a child, I thought like a child, I reasoned like a child. When I became a man, I put childish ways behind me. 12Now we see but a poor reflection as in a mirror; then we shall see face to face. Now I know in part; then I shall know fully, even as I am fully known.
13And now these three remain: faith, hope and love. But the greatest of these is love.
And... well... let's not forget also...
Song of Solomon 1:1-4
1 Solomon's Song of Songs.
Beloved [a]
2 Let him kiss me with the kisses of his mouth—
for your love is more delightful than wine.
3 Pleasing is the fragrance of your perfumes;
your name is like perfume poured out.
No wonder the maidens love you!
4 Take me away with you—let us hurry!
Let the king bring me into his chambers.
