Ikhlas

Ikhlas is something so hard to grasp and gauge that it is likened to a small black ant on a cold black stone in a great dark cave in the shadow of the night.
But know that because of its nature once you shed light onto it, you will destroy it.
It would go up in flames instead.
So many ways for this: fire of arrogance, pride...sin.
To avoid this, better we keep mum.
The issue of ikhlas lies between the doer and Allah. It is He alone that knows it and He alone will reward it.
Better if you, the receiver or even the observer, to keep mum and give supplications to the doer instead.
I beg you, don't open up those gates of hell.
Say, "MasyaAllah, may he or she be rewarded by Allah swt".
That is the only thing that you should do.