It is too often believed that a person in his progress towards perfection passes from error to truth; that when he passes on from one thought to another, he must necessarily reject the first. But no error can lead to truth. The soul passing through its different stages goes from truth to truth, and each stage is true; it goes from lower truth to higher truth.
Not only we can, but some have reached perfection; so no matter what finer bodies come, they could only be on the relative plane and could do no more than we, for to attain freedom is all that can be done.
Our Soul is a spark of the Divine. It is pure and perfect. Evil deeds merely obstruct our vision of the true nature of our Soul. Through good deeds we can become conscious of this perfection again.