In righteousness shalt thou be established: thou shalt be far from oppression; for thou shalt not fear. Isaiah 54:14
Righteousness is the foundation to be built upon in the life of the Believer! When we understand that we are always the righteousness of God in Christ Jesus (2 Corinthians 5:21), we won't beat ourselves up for "mistakes" that we have made. God's righteousness has been imparted to us as a free gift (Romans 5:17) and is not based on good or bad performance.
It would behoove us to meditate on this fact, especially when we feel like we have blown it! When you feel like you've made a seemingly terrible mistake, say out loud, "I am the righteousness of God in Christ Jesus." Also say, "there is therefore now no condemnation to those who are in Christ Jesus" (Romans 8:1). The Bible is emphatic that the way we reign in life is by simply receiving abundance of grace and the gift of righteousness (Romans 5:17). Don't beat yourself up on today about "mistakes" but understand that you are never condemned and remain perpetually righteous!