"Let us draw near to God with a sincere heart in full assurance of faith, having our hearts sprinkled to cleanse us from a guilty conscience and having our bodies washed with pure water." -- Hebrews 10:22
In life there are many benchmarks of maturity. At sixteen, one can drive a car. At eighteen, he can vote. You know you have achieved maturity when at age fifty you undergo your first colonoscopy! I'm not so sure a colonscopy is a benchmark anyone looks forward to, especially since the process of cleansing the intestinal tract is unpleasant and exhausting. Yet there are people who routinely go through the colon cleansing process to rid their bodies of impurities and toxins. Sadly, they don't change the dietary habits which make that practice desirable or necessary.
Neither do we as sinners ever completely rid ourselves of the destructive habits that make us impure. That is why we need a Savior. As humans living in a fallen world, we are incapable of keeping ourselves "unspotted from the world" (James 1:27, KJV). We may think we are doing all the right things -- going to church, reading the Bible, praying, and serving others -- but we are stained by the sins we commit and corrupted by the worldly influences around us.
Jesus died on the cross to cleanse us from our sins, once and for all. His blood covers all our sins--past, present, and future. Unlike a routine colonoscopy, which is recommended every few years, we only have to acknowledge Christ's sacrificial death and receive him as Savior once. Does that mean we will never sin again? No, but as we confess our sins, he is faithful to forgive us time and time again and to cleanse us from all unrighteousness (1 John 1:9).
Have you been cleansed once and for all? If not, pray to receive Christ as your Savior and you will be.