And you remember your Lord with your soul beseechingly and fearfully without loudly in word in the dawn and dusk, and you shouldn't be among the heedless.
Through this verse, the Messenger is commanded to remember Lord beseechingly and fearfully with his soul and without raising the voice both in the morning and evening. This was the mode of prayer Messenger followed in the early period of his Messengerhood when a group of believers was not formed. Congressional prayer is only advised when there is a group of believers. Lord knows the status of the chests, so there is no need to proclaim the prayer loudly.
Before receiving Adhikir even Messenger Muhammad was among the heedless as explained in verse 12: 3. Through this Lord is commanding the Messenger and believer not to become heedless. Adhikr is sent down to warn a people where their forefathers didn't warn with It as told in verse 36: 6.
Today, the aimless and heedless Fujjar by hiding and rejecting Adhikr are preferring bodily and worldly life without considering the soul and Hereafter. They are uttering with their tongue in their prostrations without the participation of the soul. Their concept about Lord is evil. They are not considering the Lord as the Acquainted and Observer of everything as explained in verses 2: 115 and 255. The prayers of Fujjar are nothing except whistling and clapping as explained in verse 8: 35. Any Fujjar who didn't judge in his individual, family, and social life with Adhikr, such are the disbelievers, wrongdoers, and transgressors as explained in verses 5: 44, 45, and 47. See explanation 2: 152; 6: 93-94; 7: 179, and 17: 17.