When the right thing is understood, but one slackens his performance then his attention will become commanded by the cares of the world, the deceitfulness of riches and the lust of other things. When these things come to dominate one's interest, his performance of the more important spiritual insights will fail. Belief without performance will never produce desired results. It is like planting seeds in your garden, watering the garden until they sprout, then failing to continue to water and weed thereafter. Likewise, a person caught by procrastination in the stony and thorny ground of mere belief, will never reap the fruits of his ideals.