The aim of Satanic power is ...

The aim of Satanic power is to cut off communication with God. To accomplish this aim he deludes the soul with a sense of defeat, covers him with a thick cloud of darkness, depresses and oppresses the spirit, which in turn hinders prayer and leads to unbelief - thus destroying all power.
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 James O. Fraser

Quotes from the same author

I believe it will only be known on the last day how much has been accomplished in overseas missions by the prayers of earnest believers at home.
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 James O. Fraser
I know enough about Satan to realize that he will have all his weapons ready for determined opposition.  He would be a missionary simpleton who expected plain sailing in any work of God.
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 James O. Fraser