What do these comments have in common?

"Working in a large medical center like Mayo, Mr. Marek [a hospital chaplain] said, 'You hear tons of stories about the power of prayer, and I don't doubt them.'" (NY Times)

"A person of faith would say that this study is interesting," Mr. Barth [spiritual director of Silent Unity] said, "but we've been praying a long time and we've seen prayer work, we know it works, and the research on prayer and spirituality is just getting started." (NY Times)

"Dr. David Stevens, executive director of the Christian Medical and Dental Associations, said he believes intercessory prayer can influence medical outcomes, but that science is not equipped to explore it. 'Do we control God through prayer? Theologians would say absolutely not. God decides sometimes to intervene, and sometimes not,' he said." (Houston Chronicle)

"'Maybe the people weren't praying very hard,' Higgins said of the study. 'I have no doubts that intercessory prayer works, (just) not all the time.' Even Christ's prayers in the garden of Gethsemane weren't answered, Higgins said. 'At the end, it's God's will be done. ... I don't know how you can measure those things.'" (St. Petersburg Times)