I think the key to passion, to zeal, is gratitude. Or to put it another way, the fuel to motivate is gratitude.
God's standard of judgment goes down to the intents of the heart.
Either there is a God or there isn't. Both possibilities are frightening.
Darwinian evolution is unscientific, unobservable, unbelievable, but understandable in a world that hates God.
It is embarrassingly unscientific to speak of anything creating itself from nothing.
The Gospel comes in power and the Holy Spirit, with much assurance. If you call upon the name of the Lord, God will transform you on the inside, give you the shock of your life, and give you everlasting life on top of that.