Virtue: Subhanallah (Glory is to Allah),
Walhamdulillah (and praise is to Allah),
Wala ilaha illallah (and there is none worthy of worship but Allah),
Wallahu akbar (and Allah is the Greatest)
"This Dhikr is dearer to me than all that the sun rises upon (i.e. the whole world)"
This combination of Dhikr is the one of the most beloved by Allah subhana wa ta'ala. When you say them, sins fall off you like leaves fall off trees.
Easy Dhikr can be done anywhere and anytime:
"And when you have completed the prayer, remember Allah standing, sitting, or [lying] on your sides." (Surah Nisa Verse 103)
During night or day, on firm ground or on in the sea, on a trip or at home, in wealth or poverty, in sickness or in health, in secret or announced, in all situations.
SO the more we remember Allah the more our Iman will increase each and everyday and the more our hearts and souls will be illuminated in peace and tranquility!
Reference: Muslim #2695