What is the shortest and most idiomatic way of translating this Russian expression?

Question

There is a Russian expression "kto yasno myslit, tot yasno izlagayet". It roughly means "he who thinks clearly can express his thoughts clearly". This expression could be translated in a variety of ways, for example: "Clear thinking ensures clear expression" or "Clear thought - clear expression", or even "Logical thinking allows logical expression", or maybe "You can't be eloquent if you can't think clearly" and so on. Can you offer a better suggestion for translating this phrase?

Answer 1

You have done it already so well, that I (a Russian) don't even have anything to say...
Maybe...

Clear thinking takes you to clear explaining.
Think clear - speak/talk clear.
Think plain - speak/talk bright.
One who has order in thoughts has order in words.
One tidy in thoughts is tidy in words.

Answer 2

"Only the witty can react in time."
or
"Only the witty can react appropriately."

This is how I would transfer this Russian saying to English.
Don't stick with the single words too much.

Answer 3

Well prepared, well expressed