In the story found in Mark 2:1-12 we are given a snapshot of the type of faith that is required of us. Most of us have heard this story of the four men lowering their paralyzed friend down through a roof to the feet of Jesus. It is easy to glaze over this story and continue reading without stopping to put yourself in their sandals, carrying their friend on a bed.
The first item I think of is having the option to push through the crowd to Jesus or walking up the stairway along the side of the house to the roof. That crowd must have thick as mud, everyone must have forgotten to wear deodorant that day if the four men found the way up the stairs easier.
The second obstacle is the roof. Roofs in first century Israel were flat so that the owners could relax on the roof during the day and evening if they wanted. They were built by laying hardened clay slabs on wooden beams that ran across the expanse of the house. Then once the slabs were in place the builder would pour and smooth wet clay onto of the slabs to act as a sealer against the weather (rain, snow, wind, etc).