"Therefore we also, since we are surrounded by so great a cloud of witnesses, let us lay aside every weight, and the sin which so easily ensnares us, and let us run with endurance the race that is set before us"
The Christian life is described as a race. In this passage the writer of Hebrews uses the imagery of a runner. Just as a runner will refrain from those things that would hinder him, we are to do the same. He says lay aside every weight, and the sin which so easily ensnares us. The weight and sin that entraps is unbelief. The Jews that were being addressed here had not come completely to Christ. Verse 4 says they had "not yet resisted to bloodshed, striving against sin." They were carrying the weight of their unbelief and therefore ensnared by it.
If we are going to run with endurance we must always deal with our sin and always keep our eyes on Jesus who is the author and finisher of our faith (v.2). Are you running with endurance in the race? Have you cast off the sin of unbelief and come completely to Him? Are you looking unto Jesus? Examine your heart today and ask God to show you if you truly are His? If so, ask Him to open your eyes to those things that ensnare and hinder you in the race.