Thirukkural -1253
I do try to hide my lust; but it shows up
despite my intention, just like a sneeze.
மறைப்பேன்மன் காமத்தை யானோ; குறிப்பு இன்றித்
தும்மல்போல் தோன்றிவிடும்.
This couplet is under the chapter நிறை அழிதல் – losing her reserve. He has been away for long time. She is waiting for him to come back, and losing control of herself. When her friend advises her to conceal her feelings she replies saying “I do try to hide. But this lust comes upon me suddenly, like a sneeze that one cannot control even if one tries to.”