If you tell God no because He won't explain the reason He wants you to do something you are actually hindering His blessing. But when you say yes to Him all of heaven opens to pour out His goodness and reward your obedience. What matters more than material blessings are the things He is teaching us in our spirit.
It is not fitting when one is in God's service to have a gloomy face or a chilling look.
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It's a mystery. That's the first thing that interests me about the idea of God. If there is one it's mysterious and powerful and awesome to even consider the concept and you have to take it seriously.