Worrying about the dunya is a darkness in the heart, while worrying about akhirah is a light in the heart.
Uthman ibn AffanThree worldly things have been made dear to me: feeding the hungry, clothing the naked and reading the Qur'an.
Uthman ibn AffanAbsorption in worldly affairs breeds darkness in the heart, and absorption in the affairs of the next world enkindles light in the heart
Uthman ibn Affan