You have a cloth which you dip in coloured water – but for some reason you only dip partially – then you take out. A little bit has changed colour but not the whole.
We can do this a few times, but the original colour is still more – or we can say, still being controlled by the bigger part – it's like an iceberg, controlled by the larger part underneath the water. Momentarily it's okay but then the larger part will control.
We must soak the cloth deep into the water, then when we take it out it is difficult to change the colour. Once or twice is not enough.
Through long time regular practice of ki class mediation we purify our minds (get rid of fear, anger, arrogance, anxiety, etc…), then naturally everything will follow.