Jesus Christ carries on intercession for us in heaven; the Holy Ghost carries on intercession in us on earth; and we the saints have to carry on intercession for all men.
The main characteristic which is the proof of the indwelling Spirit is an amazing tenderness in personal dealing, and a blazing truthfulness with regard to God’s Word.
To say that ‘prayer changes things’ is not as close to the truth as saying, ‘prayer changes me and then I change things.’ God has established things so that prayer, on the basis of redemption, changes the way a person looks at things.