This sentence comes from a passage about the karma of the three realms in the Shurangama Sutra, the top of the Buddha. Based on feelings, pure thoughts fly, that is, heaven is born, pure feelings fall, that is, thinking is yang, so it tends to be light, and feelings are yin, so it tends to be down.
Pure feelings and no thoughts, falling into nasal hell, nine feelings and one thought, falling into endless hell, eight feelings and two thoughts, falling into all kinds of hell, seven feelings and three thoughts, falling into a hungry ghost, six feelings and four thoughts, degenerating into a beast road, five feelings and five thoughts, will give birth to human nature.
See if you love or think too much, and you will know what kind of career you are creating. Thinking is visualization. If you meditate on Buddhism and practice the Pure Land Method, you can go to the Pure Land.
The full name of Shurangama Sutra is Shurangama Sutra, which is a very important Buddhist classic. It is said in the Complete Sutra of Destroying Dharma that in the last Dharma era, the Shurangama Sutra was destroyed first, and then the rest of the classics were destroyed. If the Shurangama Sutra is immortal, then the era of Buddhism is before now.
The Shurangama Sutra includes: preface, three interpretations, ten interpretations, interpretation of truth, four subjects of enlightenment, seven interpretations, examination of subtle doubts, explanation of roots, twenty-five holy chapters, four kinds of pure religion, shurangama mantra, twelve kinds of life, revision of calendar, seven interests and Sadas.
References:
Baidu encyclopedia-shurangama sutra