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The cross before me
The world behind me
These lyrics are trying to tell us that we humans are always fallible to sin and that is because of the worldly temptations around us. These lyrics tells us despite all these attractions around us, always set your eyes on the cross hence "The cross before me" and never ever turn towards the world hence 'the world behind me'. Always set your eyes on Jesus because He is our one true savior and not the world.