Matthew 5:13 KJV
Ye are the salt of the earth; but if the salt have lost his savor, wherewith shall it be salted? it is thenceforth good for nothing, but to be cast out, and to be trodden under foot of men.

Have you ever had to eat food without any salt or seasoning? It is tasteless and hard to swallow. We have a relative who was told by the doctor about what they could eat, he said "if it taste good, spit it out." In our spiritual life we need to have a life that is savory. We need to remember that we represent our Lord to those around us. If our christian lives have lost it's saltiness, we are useless and are not worth a thing to Him. We must always strive to improve ourselves for Jesus sake. When I am cooking I want my food to look good and taste good. I want it to be the best I can make it. How much more should I want my life to be the best it can be to represent my Lord. I want my life to be an encouragement to others so it will be a blessing to God. I don't want to be cast out and trodden on, not fit for the Lord. When we are willing to let God take control of our life, He will make it into something salty and savory for Him.

CSH