When you say Allahu Akbar, you are throwing away the worries of the world and fleeing to ALLAH SWT.

“They can't hurt you unless you let them.”

If you correct your hidden deeds subsequently Allaah will correct your outward deeds. Ibn Taymeeyah – 'al-Fatawa' 3/277

"The wise person is the one who pays attention to his time and does not treat it as a vessel to be filled with cheap things and vain talk. Instead, he limits it to worthy efforts and righteous deeds that please Allaah and benefit other people. Every minute of a person’s life carries the potential to raise his own status and to make his people happier, little by little."