With accent marks:
Когда́ я ем, я глух и нем.
When I eat I am deaf and mute.
This Russian saying is well known to all Russian kids. Parents tell this to their children so they don't get distracted when eating and focus on finishing food first.
To be noted, some creative kids (or adults) came up with the opposite version of this saying: когда я кушаю, я говорю и слушаю.
Other Russian proverbs
A holy place is never empty.
The best is the enemy of the good.
Get your sleigh ready in summer and your (horse-drawn) cart in winter.
Silent means consent.
Water does not flow under a lying stone.
You can't hide an awl in a bag.
We don't appreciate what we have but we cry when we lose it.
The eyes are scared, but the hands are doing.