With accent marks:
Заста́вь дурака́ бо́гу моли́ться – он и лоб расшибёт.
Make a fool pray to God - he will break his forehead.
This proverb is about a stupid person who, being too zealous, only harms the cause.
The proverb originates from the customs of the Orthodox Church. During prayer, believers give obeisances to the earth, trying to touch the floor in the temple by the forehead.
A fool, from excessive diligence, can bow so hard that his forehead will also be smashed against a stone floor.
Other Russian proverbs
The eyes are scared, but the hands are doing.
One head is good, but two ones are better.
Don't bring your set of rules in a foreign monastery
Everything has its time.
Free cheese is only in a mousetrap.
Bitter truth is better than sweet lies.
Don’t wave your fists after the fight.
Live for a century, learn for a century, but die being a fool anyway.