In Yourself Encased

Fyodor Tyutchev, Silentium, tr. Anatoly Liberman (in his On the Heights of Creation):

                Speak not, lie deep, do not reveal
                Things that you wish or things you feel;
                Within your soul's protected mine
                Let them ascend and then decline
                Like silent stars in heaven bleak:
                Admire their sheen—but do not speak.

                How can a heart be put in words?
                By others—how can one be heard?
                Will people know what you live by?
                A thought expressed becomes a lie.
                Don't muddy springs that are unique:
                Drink from their depth—but do not speak.

                Live only in yourself encased;
                Your soul contains a world of chaste,
                Mysterious thoughts, which outside noise
                Robs of their magic and destroys;
                The rays of morning make them weak—
                Enjoy their song—but do not speak!