Zech. 10 "6 "I will strengthen Judah and save Israel ; I will reestablish them because I love them. It will be as though I had never rejected them, for I am the LORD their God, who will hear their cries. 7 The people of Israel will become like mighty warriors, and their hearts will be happy as if by wine. Their children, too, will see it all and be glad; their hearts will rejoice in the LORD. 8 When I whistle to them, they will come running, for I have redeemed them."
As a football coach, I am trying to instill a "fighting spirit" to compete- it is not seen much today. We cannot allow ourselves to become so soft that we are not willing to stand and fight for what is right. We are in a war vs. Satan, the world, and our flesh. We need to become tougher and resist with passion.
Christ's love constrains us, His law gives us the proper boundaries, but within that is still the need to fight. Remember His actions in the temple vs. the money changers.
When we experience the peace of Christ and are restored to God, and fight for Him- our hearts become truly happy!