A quote from F. W. Krummacher on the importance of not relying on past experiences:
There are many Christians who know of no other nourishment for their inward life than the moldy bread of long past experience. But no true peace results from this. Inward religion does not consist in a life of morbid security, arising from the recollection of having once received the forgiveness of sins. Where a real spiritual life exists, there is also constant activity, unceasing striving against sin, repeated humiliation before God, and renewed experience of His favor. Were it otherwise, why should the Lord put into His children’s lips the daily petition, "Forgive us our trespasses!"~F. W. Krummacher (The Suffering Saviour, Chapter 4)
This quote was taken from Samuel Jackson's translation of F. W. Krummacher's book The Suffering Saviour: Meditations On The Last Days Of Christ.