Rudolf Steiner: 'Let us now reflect upon another feeling by means of which we can in another way attune ourselves in moral harmony with external nature. When the trees are bursting into leaf and the meadows are filled with green, let us fix our gaze upon the green which in the most varied manner covers the earth or meets us in the trees; and again we will do this in such a way as to forget all the external impressions which can affect our souls, and simply devote ourselves to that which in external nature meets us as green. If once more we are so circumstanced that we can yield ourselves to that which springs forth as the reality of green, we can carry this so far that the green disappears for us, in the same way as previously the blue as blue disappeared. Here again we cannot say, “a color is spread out before our sight,” but (and I remark expressly that I am telling you of things that everyone can experience for himself if he fulfills the requisite conditions) the soul has instead a peculiar feeling, which can be thus expressed: “I now understand what I experience when I think creatively, when a thought springs up in me, when an idea strikes me: I understand this now for the first time, I can only learn this from the bursting forth of the green all around me. I begin to understand the inmost parts of my soul through external nature when the outer natural impression has disappeared and in its place a moral impression is left. The green of the plant tells me how I ought to feel within myself when my soul is blessed with the power to think thoughts, to cherish ideas.” Here again an external impression of nature is transmuted into a moral feeling. . . . Then the green mantle of plants so works upon us that we feel and perceive in our inner being something spiritually bursting forth into bloom.'
Related post: http://martyrion.blogspot.com/2016/01/rise-and-shine.html