But let endurance and steadfastness and patience have full play and do a thorough work, so that you may be [people] perfectly and fully developed [with no defects], lacking in nothing.—James 1:4
Patience is extremely important for people who want to glorify God and enjoy their lives. If we are impatient, the situations we encounter in life will certainly cause us to react emotionally.
The next time you have to wait on something or someone, instead of just reacting, try reminding yourself, Getting upset will not make this go any faster, so I might as well enjoy the wait. Then perhaps say out loud, “I am developing patience as I wait, so I am thankful in this situation.” If you do that, you will be acting on the Word of God rather than reacting to the unpleasant circumstance.