Sheri does not want to come across as though she never struggles to understand why a loving God would allow this terrible disease or any other horrific things of this world, or that she never feels angry about this journey she is on. She thinks and feels all of those things. But she chooses to believe that God uses all things together for good, and that God is in control. She believes God has a plan for her life... that is what faith is :)
Question: "What is the definition of faith?"
Answer: Thankfully, the Bible contains a clear definition of faith in Hebrews 11:1: “Now faith is the assurance of things hoped for, the conviction of things not seen.” Simply put, the biblical definition of faith is “trusting in something you cannot explicitly prove.”
Above excerpt from http://www.gotquestions.org/definition-of-faith.html
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