Spurgeon on prayer

"Dear friend, do you have your mouth full right now? What of? Full of complaining? Pray to the Lord to rinse that black stuff out of your mouth, for it will little help you, and it will be bitter in your bowels one of these days. Oh have your mouth full of prayer, full of it, so that there is room for nothing else.. Still, prayer itself is an art that only the Holy Spirit can teach us. He is the giver of all prayer. Pray for prayer. Pray until you can pray. Pray to be helped to pray, and do not give up praying because you cannot pray. It is when you think you cannot pray that you are most praying. Sometimes, when you have no sort of comfort in your supplications, it is then that your heart, all broken and cast down, is really wrestling and truly prevailing with the most High"