Wise men read very sharply all your private history in your look and gait and behavior. The whole economy of nature is bent on expression. The tell-tale body is all tongues.

للرجالِ الحكماء بصيرةٌ حادة؛ إذ تَراهم يتصفّحونَ تفاصيلَ تاريخِك الشخصي في ملامحِك ومشيَتِك وأفعالِك. طبيعَتُك مَجبولةٌ على التعبير؛ جَسَدُك الواشي له ألفُ لسانٍ ولسان.

- Ralph Waldo Emerson

Nietzsche formulates three tasks for which [teachers] are necessary. One needs to learn to see, to think, and to speak and write. The goal of education, according to Nietzsche, is “noble culture.” Learning to see means “getting your eyes used to calm, to patience, to letting things come to you”—that is, making yourself capable of deep and contemplative attention, casting a long and slow gaze.

— The Burnout Society

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Every man has a conscience and finds himself observed, threatened, and, in general, kept in awe (respect coupled with fear) by an internal judge; and this authority watching over the law in him is not something that he himself (voluntarily) makes, but something incorporated into his being.

— The Burnout Society

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Those who know, do not speak
Those who speak, do not know

- Lao Tzu

New travellers on the roads of knowledge are like the nouveau riche: they love to show off their recently acquired wealth/knowledge. You see them eager to debate, to prove a point, to win an argument, and to make their nascent intellect as visible as possible.
This is why you see that most of 'those who speak, do not know.'

Nouveau riche (n.)
Originally from French; are people from a low social class who have recently become very rich and like to show this publicly.

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قالت لي السمراء:
ما هذي الدموع؟
واسوأ ما في الرجال البكاء
أو كلماتُ الضعف تستجدي الرثاء
تُحَطِّم في داخلي أُسطورة الكبرياء
لرجلٍ يَزعَم: لا تقهره النساء
أو يتحطم شراعُه إذا ما واجه الأنواء

قالت لي السمراء:
بربّك قل لي
أحِينَ يُحِب الرجل ينكسِر؟
أم أنّه بالحب وحدَه ينتصر

(نزار قباني)

Depression—which often culminates in burnout—follows from overexcited, overdriven, excessive self-reference that has assumed destructive traits. The exhausted, depressive achievement-subject grinds itself down, so to speak. It is tired, exhausted by itself, and at war with itself. Entirely incapable of stepping outward, of standing outside itself, of relying on the Other, on the world, it locks its jaws on itself; paradoxically, this leads the self to hollow and empty out. It wears out in a rat race it runs against itself.

— The Burnout Society

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R. D. Laing talked about a similar thing in his 'The Divided Self' but I can't find the exact quote