Whenever such question arose in my mind, I only recall the following...
Its in Hadees Shareef...

"Allah Ki Zaat Pe Ghoor na karo balke uski Siffaat pe ghor karo"

I found the following site related to this topic...
http://www.witness-pioneer.org/vil/B.../chapter2.html

See the material under the topic "Faith in the Unknown"

Regards,

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A Man Would Do Nothing,
If He Waited Until He
Could Do It So Well
That No One Would Find Fault
With What He Has Done.