What Is Faith? What Will True Faith Bring to Us?

What is faith? Under comfortable environments, with our works going well and family lives being peaceful, many of us will have the faith to follow the Lord, actively reading the Bible and attending meetings; however, once something unpleasant happens, we will become weak immediately. For example, when we are facing living difficulties because of losing our jobs, when our families lose peace due to something against our wishes happening, or when we are always refused a new job in spite of our praying, we begin losing our faith in God. Then, in consideration of all these things, what is real faith exactly?