Like a fish in water.
More Arabic Proverbs:
They were two, but united; we were a hundred, but divided.Arabic
When the reason is known, there will be no more shock.
Arabic
If you know then it's a disaster, and if you don't know then it's a greater disaster.
Arabic
When you cannot bite a hand, kiss it.
Arabic
When you cannot bite a hand, kiss it.
Arabic
Threaten him with death so that he may be content with fever.
Arabic