The noble scholar, Shaykh Muhammad ibn Saalih al ‘Uthaymeen rahimahullaah stated:
It is binding upon the student of knowledge that he makes apparent the effect of seeking knowledge upon himself in worship and in methodology and in interactions with other people – so that he is known for abundance of acts of worship and turning in recourse to Allaah, the Most High, and reverence and humility in front of Him and perseverance in making remembrance of Him, He the Most High… So let him make manifest the effect of knowledge upon himself in the worship of Allah, the Mighty and Majestic, and turning in recourse to Him and turning repentantly to Him.
And that his heart does not become neglectful of the remembrance of Allaah, for indeed the heart becoming neglectful of the remembrance of Allaah is a cause of disappointment and loss of time and lack of success.
And listen carefully to the statement of Allaah, the Most High:
And do not obey the one whose heart We have made heedless of Our Remembrance and who follows his desires. And his affair has been lost.
Soorah al Kahf (18) aayah 28
“his affair” – meaning his affair in its entirety – is “lost” – there is no blessing in it.
However if a person is constant in remembrance of Allaah, the Mighty and Majestic, with the tongue and the heart and the limbs, then there occurs in his lifespan blessing and the goodness is plentiful.
And read the statement of Allaah, the Most High:
Indeed in the creation of the heavens and the earth and the alternation of the night and the day there are signs for the people of understanding.
Soorah aale ‘Imraan (3) aayah 190
Meaning – for the people who possess intellect.
Those who remember Allaah standing, sitting and lying down on their sides and who ponder over the creation of the heavens and the earth.
Meaning they say:
Our Lord, You have not created this without purpose. How free and far removed are you from doing anything without purpose. Then save us from the punishment of the Fire.
Soorah aale ‘Imraan (3) aayah 191
(Quoted in Wasaayaa wa tawjeehaat li tullaab il ilm p46 to 47 of Shaykh Muhammad ibn Saalih al ‘Uthaymeen rahimahullaah, translated by Nasser ibn Najam)
 Refer to the Tafseer of at Tabaree rahimahullaah