Is there a problem with this claim?

In his book "Prayer" Philip Yancey says, " Brennan Manning, who leads
spiritual retreats several times each year, once told me that not one person
who has followed his regimen of a silent retreat has failed to hear from
God."

Is there a problem with this claim? For one it posits that the regimen
followed gives a guaranteed result. The other assumption is that God has not
spoken adequately enough to man so as to require Mr. Manning's (or any other
formula) regimen.

Philip Yancey is a well known Christian author being promoted by almost
every church in America. He has written several books like, The Case for
Christ and The Case for Faith, in which he methodically takes the
necessary logical steps to show the rationalization for believing in Christ
and for having a Faith. In the Cases for Christ and Faith, he points his
readers to a studious approach to the Bible and posits historical
investigations in order to believe the dialogue God has given to man. Those
two books will strengthen your belief in God and what He has done in times
past.

However, now when it comes to prayer he goes down a contradictory turn. Mr.
Yancey wants to convince us that although, "I heard no audible voice, and
yet at the end of the week [of Brennan Manning's retreat] I had to agree
with Brennan that I had heard from God."

Which is it? Do we believe the teachings of the Bible based on historical
evidence and prepositional truths in a rational dialogue or do we follow the
Brennan regimen to know God has spoken. Should any teaching in the Bible be
based on any one subjective notion? That Mr. Yancey has confessed to "no
audible voice" and has agreed that Mr. Brennans' regime allows Gods voice to
be heard, makes me wonder why Mr. Yancey bothered at all with investigating
the historical background to prove the existence of Christ or a rational
Faith of the Bible. Why not just ask God to speak all those truths in the first place?

Don't worry Mr. Yancey no one will challenge your suggestion that God speaks
in subjective ways. You are already like most Christians today, who are not
content that the Bible is a sufficient enough dialogue from God to man. Who
needs content when you can take a course on how to hear from God?

Dennis Cogdill
jgdoctrine@gmail.com