“Don’t look outside” comes from a Buddhist theory: don’t look outside.
Buddha has long asserted: Whatever you seek is suffering. He also said: There is no need to seek high quality. The mind has no external objects and is equivalent to nothingness.
Don’t seek understanding from outsiders: focus on practicing Buddhism and don’t “seek” from outsiders.
Buddhism believes that from the source of life, everything is originally sufficient and perfect. There is no need to pursue it externally. All dharma is already present in your own heart.
"Don't ask outside for anything" also comes from a famous saying: The way of the sage is that we are self-sufficient and don't ask outside for help.
Source: Wang Yangming's Mind Learning - Longchang Enlightenment.
Interpretation: What is the way of a saint is conscience, and everyone has conscience. The standard for judging whether something is right or wrong is conscience, not external things.
Allusion:
In the first year of Zhengde of Emperor Wuzong of the Ming Dynasty (1506), Wang Yangming was punished by the imperial staff forty because he opposed the eunuch Liu Jin and was demoted to Longchang, Guizhou (Seventy Years in the northwest of Guiyang). Li, Xiuwen County Governor) was the postmaster. The mountains in Longchang are sparsely populated, and Miao and Liao people live together.
In the quiet and difficult environment of Longchang, Wang Yangming reflected on his experiences over the years day and night. In the middle of the night, he suddenly had an epiphany and believed that the heart is the root of all things, and thus put forward the proposition that the heart is reason. Realizing that "the way of the sage is self-sufficient in nature, it is wrong to seek truth from it." This is the famous "Longchang Enlightenment".
Extended information:
Don’t look outside, but look to yourself. This is the way to practice spirituality or practice Buddhism.
The heart is the Buddha, don’t look outside, the pure and bright body is the original body, and the Buddha’s name and mantra are used. There is no duality between body and function, they are all intrinsic. The mantra is the heart, and the heart is the mantra.
Enlightenment is to remove the obstacles and see the pure nature. It is precisely the result of reciting the Buddha's name and chanting the mantra to clear the clouds and see the sun.
Think of your own nature and see your own nature.
Just as the "Wheel of Life" painted on the outer walls of many temples depicts: King Yama is holding a mirror, which reflects the "Twelve Causes and Conditions". scene.
What is the function of a mirror? It is to reflect yourself. Therefore, don't ask outside, which means that you don't need to ask for external help. Just like looking in a mirror, it is enough to explore yourself, that is, to get rid of self-grasping.
Don’t seek outside, but seek from yourself. If you don’t hold on or expect anything, you will be able to see through the world of mortals and feel relieved.
Baidu Encyclopedia-Looking outside