And a second feeling, a feeling of fear, overcame him. He thought that he had gotten rid of that a long time ago. But it was a different kind of fear from the ones he'd known previously. It was a feeling of his own smallness and weakness as a man compared with the sublime Godly being when he let a second word of Christ live in his soul: “Become perfect even as your Father in Heaven is perfect.”
These two words should live in the soul of every esoteric. An esoteric should kindle full devotion for divine beings in his soul. Thereby the consciousness develops that what one does isn't so good, but that one should always try to become more perfect. We should look at what's developing in one's soul. God lives in developing things. If we get to the point where we're acting in a good and noble way, then it's God in us who's good. The God who lets us act in a good and noble way is our archetype itself, that created us. We must become a complete copy of this archetype.
Be it ever so hidden, there's a selfish motive in everything we do. We must realize that we can't be selfless. It's a world karma that lets us act egoistically. But world karma is God. Everything that God is and does in the way of good is better than we could do it. An esoteric should tell himself: Let me do something that I have made it my duty to do, let me do it as hard as I can and in such a way that I tell myself that the divine element that's at work in me is doing this and I'm only the instrument of this godly element — then the Higher Self in its striving towards perfection is revealed to him.
-Rudolf Steiner, August 30, 1909: From the Contents of Esoteric Classes