With accent marks:
Видна́ пти́ца по полёту.
A bird is visible by its flight.
You can say anything about yourself, but only your actions will show your true value. A person is judged not by his words, but by his deeds.
The closest English equivalent is "A bird may be known by its song".
Other Russian proverbs
Live for a century, learn for a century, but die being a fool anyway.
A fisherman sees a fisherman from afar.
Don’t wave your fists after the fight.
We don't appreciate what we have but we cry when we lose it.
(lit.) Whoever gets up early, God gives him
There are no friends for taste and color.
If you like sledding, you should like to carry the sled.
You can't spoil the porridge with butter.