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the mountain is supposed to high above the ground, but for hexagram 15, the mountain is at the bottom trigram and the earth is at the upper trigram. Therefore it demonstrates that the mountain is willing to lower its status to the ground. Therefore this is a humble hexagram. Stay humble.
Line 1: Although we are in difficult situation, it will be resolved soon because of our good karma and humbleness. Continue do good and be good because the future will be very bright.
Line 2: Be humble and stay within our boundaries. continue do good and avoid bad company.
Line 3: The situation is favourable but if we are arrogant and immoral then disaster may befall.
Line 4: Stay calm and peaceful. Perseverance and hardworking will pay off.
Line 5: We are in favourable position. Continue do good. Any arrogant and immoral behaviour will ruin all the past effort.
Line 6: Success is here to stay. Continue the hard work and build good reputation.