Discouragement can be caused by fear, attacks from the devil, unrealistic expectations, illness, or lack of faith in God. To conquer discouragement, one must refill their spiritual energy by taking the helmet of salvation, reading the Bible, and meditating on God's word. They should also remember who God is by recalling what he has done, that he is on their side, his promises are real, he is always there, and he loves them. Finally, one must cultivate perseverance and determination by keeping active and standing up after failures, as perseverance is key to success.