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
The best is the enemy of the good.
Hurry to much and you will make people laugh.
Don't go to the woods if afraid of wolves.
A well-fed man does not understand a starving one.
Better late than never.
Each sandpiper praises its swamp.
With a darling, even a hut is a paradise.
Without labor, you can not even catch a fish in the pond.