Mark 4:24

Then he said to them, “Pay attention to what you hear.  By your own standard of measurement (that is, to the extent that you study spiritual truth and apply godly wisdom), it will be measured to you (and you will be given even great ability to respond)- and more will be given you besides.

Jesus used Smith Wigglesworth to demonstrate His power on earth.  For Wigglesworth to do this, he was constantly studying the Bible or praying.  Now, we may not be ready to raise the dead we would like to have our prayers answered.  We must practice our faith, pray and believe the word, and Jesus will work through us.