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To practice medicine, one must first eliminate greed and anger, relying solely on a sincere and authentic heart when prescribing medication; one should not seek profit from the wealthy nor show fatigue towards the poor, treating patients with solemnity as if deities were present.

Only when a person possesses perseverance and conducts themselves with uprightness and caution can they be taught the Way of Medicine. Whenever summoned for consultation, regardless of day or night, cold or heat, distance, closeness, wealth, or poverty, one should respond immediately upon hearing the call. One should regard the patient's illness as one's own, use genuine and pure medicines, have no excessive expectation of financial gain, save patients with sincerity, and not fear labor. In the unseen realm, there will naturally be divine protection. For instance, Zhang Yanming from Ruzhou practiced medicine without ever calculating money. For all who sought medical help, he aimed for certain efficacy. One day, a fire broke out in the city, burning down surrounding houses, yet his residence remained standing amidst the smoke and flames. Later, his descendants became prominent and noble. From this, we can see that the Heavenly Dao has spirits that secretly support and visibly assist, which is truly worthy of reverence.

Analyzing facial color and pulse requires attention to subtle details; early judgment of safety and danger based on disease symptoms is crucial. Quack doctors fear offending their patients' taboos, and when the condition slightly worsens, they complain and blame.

Practicing medicine is indeed difficult, but diagnosing children is even more so. Therefore, when a physician examines pediatric cases, if the facial complexion and pulse are clear and distinct, life and death can be determined. If one hesitates due to fear of offending the family's sensitivities and does not speak the truth, any slight error will inevitably invite resentment. It is better to warn beforehand than to suffer resentment afterwards. Even if difficulties arise, what is there to resent? In the past, Bian Que saw Duke Huan of Cai and said, "The disease is in the skin and muscles; if untreated, it will deepen." The Duke did not believe him. Upon seeing him again, Bian Que said, "The disease is in the bone marrow; even the Lord of Life cannot do anything about it." Eventually, the Duke fell seriously ill and could not recover. Students of medicine should reflect on this case, drawing parallels and studying diligently, thereby grasping the profound principles of Bian Que.

Yellowish or bluish complexion indicates convulsive wind (Jing Feng); redness with heat indicates Cold Damage (Shang Han); purple or pale red also relates to Cold Damage; black indicates pain; white indicates deficiency-cold and cough. One must further apply skilled techniques according to different facial areas.

Inspection, auscultation/olfaction, inquiry, and palpation are the primary methods for physicians. When examining physical forms and finger veins, listening to sounds, and observing colors, these conditions are recorded in medical texts. Skin thickness varies. Infants under one year old are mostly carried in arms; their hands are free of dirt and grease, making fingers white and tender, with finger veins clearly visible. Children aged three to five often play with mud and water, making fingers rough and thick-skinned, with hidden and hard-to-distinguish veins. Observing the facial complexion is a key shortcut. If the complexion is purple-black with coarse veins, or if the child cries angrily with altered expression, diagnosis is difficult in haste, requiring auditory assessment. Conditions such as stroke-induced coma, chronic lethargy, delayed speech, aphonia, mouth ulcers, and sore throat cannot be fully understood by hearing alone. Inquiry into symptoms is the most accurate method. However, pediatrics is known as the "Mute Department" because even older children's statements may not be reliable; some confuse fullness with other sensations, or itching with pain. Such instances require repeated attempts at questioning. Initially, parents should clarify the cause of illness to inform the doctor for analysis, facilitating treatment. Many families refuse to disclose the onset and course of the disease, leaving it to the doctor's speculation. Thus, inquiry is difficult, and pulse diagnosis is necessary to confirm symptoms. Since constitutions differ between North and South, treatment methods should be adjusted according to deficiency/excess and cold/heat. As for achieving mastery, there is no other secret than what the *Great Learning* states: "As if protecting an infant, seeking it with a sincere heart." Those dedicated to this profession must not lack sincerity in their hearts; otherwise, how can they perceive diseases that cannot be verbally expressed?