In Victor Hugo's "Les Misérables," the complexity of human thought is depicted through the inner dialogue that individuals experience. This private conversation often occurs silently, revealing the intense inner turmoil and rich emotional landscapes that exist beneath the surface of outward behavior. People can feel a great deal while maintaining an outward appearance of calm, highlighting the contrast between internal and external realities.

The quote emphasizes that the soul's truths do not require visibility or physical tangibility to be real. It suggests that the depth of one's inner experiences is valid and significant, even if they remain unexpressed externally. Hugo illustrates the idea that our thoughts and feelings hold profound importance, underscoring the notion that one's internal world is just as impactful as the tangible world around us.