“Examine yourselves to see if your faith is genuine. Test yourselves. Surely you know that Jesus Christ is among you; if not, you have failed the test of genuine faith.” (2 Cor. 13:5 NLT) 

Like a lot of young boys, I didn’t like tests in school. I was very active, likely classified as ADHD in today's terms, and the day of the test revealed how much I'd read and studied the material, which typically wasn't enough to perform well on a test. But eventually I matured, got better at it, and came to understand that testing is a great way to measure yourself and be prepared properly. In spiritual matters, the more you study the Bible, meditate on what you've read, and grow in Christ, the better you will be at navigating life's challenges. It's a good practice; continuously testing and examining your ways aids in your constant return to God in all your doings.

“Let us examine and test our ways, and turn back to the LORD.” (Lam. 3:40)

Therefore

“No, I discipline my body and make it my slave, so that after I have preached to others, I myself will not be disqualified.” (1 Cor. 9:27)

“Each one must examine himself before he eats of the bread and drinks of the cup.” (1 Cor. 11:28)