When the Wise Teacher was asked what was the greatest of all the commands, he answered that we should love the Lord our God with all our heart, soul, mind, and strength, and that we should love our neighbor as ourselves (Matt. 22:36-40).
Paul, at the end of his admonition and description of love in 1 Corinthians 13 concludes that faith, hope, and love remain, but that the greatest of these is love (1 Cor. 13:13).
The four year old who was learning to recognize words, after learning the word "love," proceeded to tell her parents that the whole Bible is filled with love, while flipping through the pages.
Jesus, Paul, and the four year old agree. It all comes back to love.
The greatest and wisest thing: LOVE.