A goatherd had sought to bring back a stray goat to his flock.  He whistled and sounded his horn in vain; the straggler paid no attention to the summons.  At last the Goatherd threw a stone, and breaking its horn, begged the Goat not to tell his master.  The Goat replied, "Why, you silly fellow, the horn will speak though I be silent." 

Do not attempt to hide things which cannot be hid.