A striking example of the symbolic expressionism. Referring to the image of fish, which has become the symbol of Christ, the artist seems to be saying about inevitable counteraction faced by those who have set foot on the path of true Christianity.
In ancient Hebrew metaphysics the purple flame color corresponds to the highest spheres and entities. It is no coincidence that the source of the purple glow here is a character sailing against the current - a fish. Nor is the source of its serene confidence - the Truth discovered.