"Aridity is the fruit of our defects."
St. Padre Pio
This quote made perfect sense to me. God is pure love and we live in His love. His love is always the same - infinite and unchanging; therefore it is our love that changes. If we were always aware of the constancy of His love I don't think we would have problems with prayer. It is our heart fluctuations that cause difficulty in prayer. God never walks away from us....we walk away from Him. The easiest way to overcome aridity for me is to remember to focus on Him. When I am caught up in my own problems and lose sight of Him, this is when my prayer life seems to suffer. I like to meditate on his love and truth when I am having prayer trouble. This seems to be a quick cure :)