Al-Muhaymin — The Guardian
الْمُهَيْمِنُ
Name 7 of the ninety-nine. The One who witnesses the saying and deeds of His creatures
Allah is Al Muhaymin (ٱلْمُهَيْمِنُ), meaning the one who ensures well being and protection over His creation.
The root
From the root ha-mim-nun (ه م ن), which has the following classical Arabic connotations: to watch over, oversee, protect, guard to be a witness to offer security and peace to determine what is true, to extend a wing.
Reflection
How do we benefit from knowing that Allah سُبْحَٰنَهُۥ وَتَعَٰلَىٰ is Al-Muhaymin? Just as Allah سُبْحَٰنَهُۥ وَتَعَٰلَىٰ is the overseer of all His creation, we need to be watchful over ourselves. Many people do not know themselves - they think they are their thoughts. We can let horrible or negative thoughts come to mind, but we don't have to identify with them.
We can let it come and pass, just like how a river flows. Identification, thinking you are your thoughts, is like a beaver building a dam in the river. This only ends up damaging the surrounding environment. Similarly, identification can be destructive, leading to either a depressive state or causing one to become arrogant or narcissistic.
Instead, it is better to try and be indifferent. Take time to observe and watch your thoughts come and go. Ask where and why they may have arisen. Analyze their depths, and you may uncover secrets about yourself hiding in your psyche. Imam Ghazali recognizes this watching as a crucial step in reforming oneself, allowing one to become a guardian over his or her heart.
Only selectively choosing thoughts that are constructive and letting everything else go. Another way in which one can try to characterize themselves by this name is to be observant of those around you. People in passing will reveal certain pains and troubles. If you are watchful, you can exhibit a Prophetic tradition of the Prophet Muhammad ﷺ which was to care for the needs of those around him.
In this sense, you are a guardian, being watchful and showing care and compassion to those around you.