Why do we pray? It might be easy to pray when one is in a ‘spiritual’ mood, but it is even more important to pray through our weaknesses and sufferings.
We pray because of the promise of God, given to us through Romans 8 - for nothing in all creation will be able to separate us from the love of God that is in Jesus Christ our Lord. He has suffered for us, and will surely share in our sufferings, just as we will surely share in His comfort.