His goodness lies within him. خيره في جوفه

خيره في جوفه
أي إنك تحقره في المنظر وتأتيك أنباؤه بغير ذلك
يضرب لمن تزدريه وهو يجاذبك
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His goodness lies within him.
Meaning, you may despise him outwardly, but news of him will reveal otherwise. This proverb is used to describe someone you look down upon, yet he is actually engaging with you.
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المثل العربي «خَيْرُهُ في جَوْفِهِ» يُضرب لمن يبدو حقيرًا أو متواضعًا في مظهره، فيُزدَرَى ويُستخف به، ثم يظهر أن فيه فضلًا أو قدرةً أو حكمةً لم تكن ظاهرة.
ومن أقرب المقابلات في الثقافة الإنجليزية: Still waters run deep.
«المياه الهادئة عميقة.»
وهو أشهر مثل إنجليزي في هذا المعنى، ويُضرب لمن يبدو هادئًا أو بسيطًا بينما يملك عمقًا أو قدرات خفية.
Don't judge a book by its cover.
«لا تحكم على الكتاب من غلافه.»
أي لا تغتر بالمظاهر.
Appearances can be deceiving.
«المظاهر قد تكون خادعة.»
There is more to him than meets the eye.
«فيه أكثر مما تراه العين.»
وأقرب مقابل للمثل العربي «خيره في جوفه» هو:
Still waters run deep.
إذا كان المقصود أن الرجل يخفي فضله وعمقه وراء مظهر متواضع.
أما إذا كان التركيز على عدم الاغترار بالمظهر، فالمقابل الأنسب هو:
Don't judge a book by its cover.
«لا تحكم على الكتاب من غلافه.»
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The Arabic proverb “His goodness lies within him” is used to describe someone who appears insignificant or humble in appearance, leading to scorn and contempt, only to later reveal hidden virtues, abilities, or wisdom.
A similar proverb in English is:
“Still waters run deep.”
This is a well-known English proverb with this meaning, used to describe someone who appears calm or unassuming but possesses hidden depths or abilities.
“Don't judge a book by its cover.”
“Don't judge a book by its cover.”
That is, don't be deceived by appearances.
“Appearances can be deceiving.”
“There is more to him than meets the eye.”
“He has more to him than meets the eye.”
The closest equivalent to the Arabic proverb “His goodness lies within him” is:
“Still waters run deep.”
If the intention is that the man hides his merit and depth behind a humble appearance.
But if the focus is on not being deceived by appearances, then the more appropriate equivalent is:

Don't judge a book by its cover.

“Don't judge a book by its cover.”

His intellect betrayed him. دَلَّ عَلَيْهِ إِرْبُهُ.

دَلَّ عَلَيْهِ إِرْبُهُ. 
قال أبو عمرو: يقال للرجل الدميم تقتحمه العين ولا يُؤْبَنُ بشيء من النجدة والفضل: دل عليه إربه، أي عَقْله.
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Abu Amr said: It is said of an ugly man, one who is not easily recognizable and who possesses no virtue or merit: His intellect betrayed him.
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التعبير العربي «دَلَّ عَلَيْهِ إِرْبُهُ» يُقال للرجل الذي لا يلفت النظر بمظهره أو هيئته، لكن فضله وعقله وشجاعته تكشف عن قيمته الحقيقية.
ليس له مقابل حرفي في الإنجليزية، لكن من أقرب الأمثال والتعابير: Don't judge a book by its cover.
«لا تحكم على الكتاب من غلافه.»
أي لا تقوِّم الناس من مظهرهم، فقد تكون قيمتهم الحقيقية في عقولهم وفضائلهم.
ومن التعابير الأقرب إلى المعنى الخاص: His worth is known by his character, not his looks.
تُعرف قيمته بأخلاقه وصفاته، لا بمظهره.
Wisdom and merit speak for themselves.
الحكمة والفضل يدلان على صاحبهما.
Appearances can be deceiving.
المظاهر قد تكون خادعة.
وأقرب مثل إنجليزي شائع يؤدي المعنى العام هو:
Don't judge a book by its cover 

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The Arabic expression “دَلَّ عَلَيْهِ إِرْبُهُ” is used to describe a man whose appearance or demeanor doesn't immediately attract attention, but whose virtue, intellect, and courage reveal his true worth.
While there is no direct English equivalent, some of the closest proverbs and expressions include:
“Don't judge a book by its cover.”
“Do not judge a book by its cover.”
This means don't judge people by their appearance; their true value may lie in their intellect and virtues.
Other expressions that closely convey this specific meaning include:
“His worth is known by his character, not his looks.”
“Wisdom and merit speak for themselves.”
“Appearances can be deceiving.”
The closest common English proverb that conveys this general meaning is:
“Don't judge a book by its cover.”

They are gradually rising up the new land. رويدا يعلون الجدد.

It is narrated as "they are rising up the soft ground." The soft ground is called "al-khabar," and the hard ground is called "al-jadid." This is used as a proverb for a man who has an ailment; it is said, "Leave him until his ailment goes away."
Qays said this on the day of Dahis, when Hudhayfah said to him, "I have beaten you, Qays!" He replied, "Wait until they rise up the new land," meaning, "until they rise up the new land." Those who narrate it as "they are rising up" have "the new land" as the object. This story has been mentioned in its entirety in the chapter on the letter Qaf, in the section on the phrase "the war of Dahis had broken out between them."

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 The closest English equivalent to this proverb is:
Wait till the ground gets firmer.
That is, wait until things improve or the problem is resolved.
Other proverbs and expressions very close in meaning include:
Give it time.
Or:
Let him recover before you judge.
Because the Arabic proverb means that the condition of the weak or sick cannot be assessed until their illness is gone and their health improves, there is a similar expression:
Every horse runs better on solid ground.
That is, every person's worth is known when their obstacles are removed. This is similar to the image of "reaching the new ground," meaning reaching solid ground after soft ground.

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ويروى "يعدون الخبار" الخبار: الأرض الرخوة، والجدد: الصلبة. -

-يضرب مثلا للرجل يكون به علة فيقال: دعه حتى تذهب علته.
قاله قيس يوم داحس، حين قال له حذيفة: سبقتك يا قيس، فقال: أمهل حتى يعدوا الجدد، أي في الجدد، ومن روى يعلون كان الجدد مفعولا، وقد ذكرت هذه القصة بتمامها في باب القاف عند قولهم "قد وقعت بينهم حرب داحس".