It is stated in the scriptures that if our motivation is found to be neutral, we should rather improve than eliminate it. The reason is that the quality of being “neutral” and “wholesome” are relatively closer to each other, whereas being “wholesome” and “unwholesome” are poles apart. So while the former can be improved, the latter must be given up. Ordinarily, before wesit down to practice or meditate, we should first examine the motivation carefully. If it was found to be neutral, we should improve it. Otherwise, none of what we do can lead us to enlightenment. The resulting virtuous karma caused by a neutral motivation may be able to bring some temporal rewards, but only very meager ones.

- Quote from The Right View, "The Three Supreme Methods"