Qur'an, Al-Muzzammil, Surah 73:6-10
Without doubt the impressions of the mind are the strongest and the speech most articulate in the vigil at night. During the day, you are engaged by the activities of life. So remember the name of your Lord, and devote yourself to Him with all your heart. He is the Lord of the East and the West, and there is no other diety besides Him. Elect Him alone to protect you, and patiently bear what they say, and avoid their company without any disagreement.