I have a coffee cup within reach most of the day when I am at work. Many times during my shift, I go tot the coffee machine and get a fresh cup of brew. And it tastes the same, time after time.
BUT, about once a week, I take my cup to the sink, and wash it out with soap and hot water. And that first cup tastes MUCH better!
Jesus tells us that our hearts are the same way. If we do not keep our sins scrubbed off, we build up layers of selfishness and pride. We become jaded to our sins, and bitter to those around us.
Keep your hands clean and your heart pure. Confess as soon as the Holy Spirit reveals sin in your life, so that you may be a source of fresh, clean Living Water to a thirsty, parched world around you.