He watched his army dwindle in size and his men become more and more scared while the Philistines became bolder and stronger. Saul became impatient and offered the sacrifice himself. Of course, just as Saul finished Samuel appeared on the scene and rebuked him for his impatience. Saul's impatience showed a distrust of God and a spirit of self-assertion in the face of God's commands. This impatience with God's timetable is a weed one of Josh's weeds that needs to be rooted out.
Some people also show impatience under trial.
James writes about some rich people who mistreated and oppressed their employees. Some of the workmen became very impatient with the treatment they received and appeared ready to rebel. We also tend to become impatient under trial. When our home is overwhelmed by one trial after another money problems and marriage problems it is so easy to become impatient. The time of judgment will come.