I love to cook. When you are cooking you want to have a good set of knives. It is important to have a good, sharp set of knives. Using dull knives is not only a lot more work, but actually very dangerous. A dull knife can cut you a lot faster than a sharp one. It is harder to control because of the amount of force it takes to cut.
It is kind of the same way with friends. I can look at my friends and identify a specific character trait that they have that has "sharpened" me. One of my friends is very wise. One is very loving. One is giving while another is a very good Spiritual mentor.
One the other side, there have been a few friends in my life who have been "dull" knives. Constantly complaining, bickering, whining and gossipping, I felt as if I were being whittled away at with a dull knife.
The Bible says that "As iron sharpens iron, so one man sharpens another." I have come to realize that the people I surround myself with and the friends I choose are very important. They are molding me and sharpening me into the woman of God that I am meant to be.