Original Sin & Grace

Karma is literally the protector of our being- as you sow, so shall you reap.

Are the conceptions of  Original Sin and Grace contradictory to Karma? This lecture may be helpful:

"Therefore to speak of the existence of Original Sin and of Grace does not denote misunderstanding of the idea of karma. For in speaking of the idea of karma we are speaking of the reincarnation of the ego in the different earth-lives. Karma is inconceivable without the presence of the ego: Original Sin and Grace, impulses which lie below the surface of karma, [are] in the astral body. We can say with truth that human karma was first brought about because man had burdened himself with Original Sin. Karma flows through the incarnations and before and after there are happenings which introduce and subsequently expurgate it. Before karma, Original Sin; and after, the victory of the Christ Impulse, the fullness of Grace."

-Rudolf Steiner