Prayer, and it's importance in the lives of God's workers and the saints. Prayer/taking hold of God has become less important, but it needs to be the most important.
The whole book, all its words, could be summed up in 1 line... Seek God!
It's is so encouraging, extremely challenging, convicting and faith building.
Nothing. Most probably my top 3, or maybe even favourite.
Prayer and seeking God is for all.
Yes, but there are some things you should know...
It's old, 1907 kind of old, so though it's not a large book, the English does make it a slower read. But reading it slowly is good.