If you were asked to complete a task you did not fully understand, would you? Noah built an ark when there was no rain, and lived on the ark for 7 days before the rain began. The rain lasted 40 days, and the floods lasted 150 days. Noah believed in that which he could not see, and obeyed God's instructions. Noah didn't need a boat until the day he needed a boat, and we can only imagine the relief he felt
the day the rain began. Faith is believing in that which you cannot see, and to have great faith is to know great miracles.
For we walk by faith not by sight (2 Corinthians 5:7).