What I see is the sage created the eight trigrams is to observe the hexagram images, and then added hexagram words to indicate the auspicious and dangerous situations of things.
Thus, auspicious and sinister situations are expressions of gain or loss (of good things). The situation of remorse and humiliation is the habit of being prepared for or suffering from grief. The change and transformation of things are the manifestations of the evolution and degeneration of things.
Masculinity and femininity are the manifestations of day or night. The change of the six lines is the embodiment of the law of change in the three aspects of heaven, earth and man.
Therefore, the principle for a gentleman is to stand up and be at ease is the order expressed in the Book of Changes. What I care about paying attention to is the lines of each hexagram.
Therefore, the gentleman usually observes the hexagrams and ponders both the hexagrams and the lines; when he takes action, he observes the changes of the hexagrams, and ponders the results of the divination. Therefore, it is possible to obtain the blessing, and it can be auspicious without any disadvantage.