When the automotive industry prepares a new model before production prototypes are subjected to extensive runs on a test track. During those tests weaknesses in design are discovered so that the engineers can correct them. In the computer industry, companies sometimes release what are called 'beta' editions of programs. Users take the programs and put them to use. As they use them they discover areas where 'bugs' exist, where the program doesn't perform as it is designed to work.
Testing produces a better product.
Our faith is developed in that way, too. As we live, the conflicts that come our way are moments of proving, showing us areas of life that need to be re-designed, improved the Holy Spirit. As we move through the proving moments, the Bible says we develop strength of character that includes perseverance. In some translations, you will find the word, patience in place of perseverance. David's work for God would be so significant, reaching far beyond being the king Israel.