This sentence is the beginning of a poem, expressing the author's inner conflicts and confusion that he dare not express. The specific meaning may vary from person to person, and different people may have different interpretations. But it can be understood as a whole that the author feels that the night is dark and the water is deep and blue, reflecting his inner confusion and confusion. Although he has many things on his mind, he cannot reveal them in front of others, perhaps because he is afraid of being misunderstood, afraid of being hurt, or for various other reasons. The meaning of this sentence can be understood as the inner secrets and the suppressed feeling that one dares not to speak out.