The specific explanation is as follows:

1. "Think less about nourishing the heart": Thinking too much will make the mind tired, so try to reduce thinking and anxiety and keep the mind quiet. Only by reducing unnecessary thinking can we make our mentality more peaceful, so it is easier to achieve the effect of health preservation.

2. "lust is not enough to nourish essence": insatiable greed will damage essence, so we should try our best to reduce all kinds of desires, especially excessive sexual desire and material desire, in order to maintain the sufficiency and purity of essence. Only by reducing desire can we enrich the essence, which makes it easier to achieve the effect of health preservation.

3. "Talking less will nourish the spirit": talking more will hurt the spirit, so we should try our best to reduce the words, especially to avoid nonsense and empty talk, so as to keep the breath stable and deep. Only by reducing words can the breath be more stable, so it is easier to achieve the effect of health preservation.

In a word, this health preserving method advocates maintaining vitality and vigor by reducing thinking, desire and words, so as to achieve the effect of prolonging life.