Fyodor Tyutchev
The most famous Tyutchev's poem is “Silentium!”. This is a hard appeal to be silent. Because a man never can understand another person. A line “A word once uttered is untrue” is one of the most popular aphorisms of Tyutchev. As well as “We can’t understand Russia by the reason” and “We are not know, what will be the respond for our word”.