God grows us in authority through the battles and blessings of life. Life is not a funfair but a battlefield.
God prepares His children through the spiritual highs and lows in what they experience.
The one battle that Satan is waging is to make people grieve, lie against and quench the Spirit of God, so that God can withdraw from our lives and churches etc, then Satan's demonic spirits can take over.
Many people wrongly assume that Satan is stupid, yet he has been studying the thoughts, actions and behaviour of humanity since the beginning of time. Also, people assume that the struggle they are facing is just a natural battle yet just beneath the surface there is something far more complex taking place.
AND THAT'S WHY WE HAVE TO FIGHT THE GOOD FIGHT OF FAITH. It's a good fight because God is involved to help, defend and give us the victory.