Olga,
A simple traslation would be--
Russia can't be understood with the intellect.
Умом Россию не понять,
Аршином общим не измерить:
У ней особенная стать —
В Россию можно только верить.
My translation:
You can't know Russia only with your mind,
Can't measure her by kilometer:
Russia is the only one of her kind -
To know her you must believe in her