Did the Little Flowers provide the common man with confidence about his own life beyond the grave? Yes and no. If a common man read Little Flowers he could think two things.
1# “Oh no. I’m not going to Heaven which means I’m doomed in hell and there’s nothing I can do about it.”
2# ” I’m not perfect, so I need a priest to ask me into Heaven. This will save me.”
Both of these options are wrong. You can only go to Heaven be believing that Jesus died for your sins and changing your life skills to ways that please God.