Andrew Murray, The Power of Persevering Prayer
“ By faith in the promise of God, we know that we have the petitions we have asked of Him. Faith takes and holds the answer in the promise as an unseen spiritual possession, rejoices in it, and praises for it. But there is a difference between the faith that thus holds the word and knows that it has the answer and the clearer, fuller, riper faith that obtains the promise as a present experience. It is in persevering, not unbelieving, but confident and praising prayer, that the soul grows up into that full union with its Lord in which it can enter upon the possession of the blessing in Him. ”
