With accent marks:
Гото́вь са́ни ле́том, а теле́гу зимо́й.
Get your sleigh ready in summer and your (horse-drawn) cart in winter.
This proverb reminds us to plan what we want to do and what we will need to do in advance so that any difficulties and unforeseen situations do not catch us by surprise.
There is almost the same proverb in English: "Repair your cart in December, in July your sledge remember".
Other Russian proverbs
A bird is visible by its flight.
Don't go to the woods if afraid of wolves.
Оne can not see the wood for the trees.
There are no friends for taste and color.
You can't hide an awl in a bag.
A wolf is fed by his legs
The beauty of a debt is its payment
(lit.) Whoever gets up early, God gives him