Our subconscious minds have no sense of humor, play no jokes and cannot tell the difference between reality and an imagined thought or image. What we continually think about eventually will manifest in our lives.

The quotation expresses a classic “mind-power” or New Thought premise: the subconscious is portrayed as literal-minded and image-driven, responding to repeated thoughts as if they were facts. On this view, sustained mental rehearsal—whether hopeful visualization or anxious rumination—tends to shape behavior, attention, and ultimately outcomes, so that inner narratives become self-fulfilling. The line about humor underscores the warning that the subconscious allegedly does not “negate” or “take a joke,” so negative self-talk and imagined catastrophes are treated as instructions. Its significance lies in linking psychology, habit, and success literature: change the dominant mental picture, and you change the life that grows from it.