From today's devotional
Repeating the same words over and over like a magic incantation is no way to ensure that God will hear your prayer. It's not wrong to come to God many times with the same requests-Jesus encourages persistent prayer. But he condemns the shallow repetition of words that are not offered with a sincere heart. We can never pray too much if our prayers are honest and sincere. Before you start to pray, make sure you mean what you say.