"And whenever the harmful spirit from God was upon Saul, David took the lyre and played it with his hand. So, Saul was refreshed and was well..." (1 Samuel 16:23 ESV)
Just think… David: God's true and anointed king at 18 years old was brought into the service of a man who no longer had the endorsement of God. He was ungodly, insecure, bitter, jealous and seriously mentally ill. He had lost all his qualification for leadership. Yet, David submitted himself as a servant to a has-been king. Notice, when Saul acted harmfully, David responded lovingly. Part of God’s preparation for David was to work under an unfit and unfair boss. However, David's responses were critical to his future. God was teaching David how to thrive and survive under poor leadership. Those who are destined by God to do great things don't get to choose their assignment. They must simply embrace it. A Godly assignment will be both a field and furnace. It will be a place of productivity for you, but it will also be a place where God is producing something in you. Joseph learned the same lessons working under His Egyptian slave owner Potifar. Yet, because of Joseph's faithfulness and patience, he prospered in all he set his hand to do and eventually was promoted to be Prince of Egypt. Leaders who become anything of substance at some point have learned to serve under unfair and possibly even toxic leaders. Young leader: be patient, faithful, humble, and fully wait on God's timing. Your honor for bad, even terrible leaders, and serving and responding to them in a humble manner will set you up for promotion later. God sees all! Don't delay or derail your destiny by acting rashly out of anger or rebellion. Be certain, on the road to becoming king you may have to serve a few Sauls along the way.