Zeal is born of hope
Where there is hope, there is optimism.
No one can be zealous about what he believes is a hopeless situation.
Enthusiasm is born of believing you are going to win.
If you really believe, that you are going to walk on streets of gold in God's Everlasting Kingdom, you will be filled with enthusiastic hope.
If you believe it is certain, that the work, God gave you to do, is going to abound in victory, you will be zealous.
Let Hope be your guide!