To trust means to walk by faith not by sight, to follow directions regardless of whether they seem to make sense or not, but how easy it is to be swayed by our intellect or our senses.
Several years ago this truth was driven home when I allowed my mind to convince me that my source must have made a mistake. Instead of following the GPS' instructions, I did what I thought was right, and as a result, a trip that should only have taken about 15 minutes got stretched to an hour (documented here if you are interested).
That was a lesson that stuck with me.
The other day, on my way to an appointment, I took a wrong turn and was thrown off course. Not wanting to waste time by trying to backtrack, I consulted MapQuest. However, as we approached my destination, and it told me to turn right, everything within me screamed no, no, no, it's on the left. Fortunately, I did not listen to that inner voice.