Ajahn Mun comparing Buddho to the Citta's food. Great simile!
“That’s too bad. Where’s it gone? Well, don’t be discouraged. Just put maximum effort into your practice and it will reappear for sure. It has simply wandered off somewhere. If you accelerate your efforts it will come back on its own. The citta is like a dog: it inevitably follows its owner wherever he goes. It won’t just run away. Intensify your practice and the citta is bound to return on its own. Don’t waste time thinking about where it’s gone to. Wherever it’s gone, it can’t possibly run away. If you want it to return quickly, concentrate your efforts. Any discouragement will only boost the citta’s ego. Thinking you really miss it so much, it will play hard-to-get. So stop thinking about the citta you’ve lost. Instead, think “buddho”, repeating it continuously, over and over again. Once the word “buddho” has been mentally established by repeating it continuously in rapid succession, the citta will hurry back of its own accord. Even then, don’t let go of buddho. Buddho is the citta’s food – as long as there is food, it will always come running back. So repeat “buddho” constantly until the citta has eaten its fill, then it will have to take a rest. You too will feel satisfied while the citta rests calmly. When it’s calm, it ceases to run madly about looking to cause you trouble. Keep this practice up until you cannot chase it away, even if you want to. This is the perfect method to use with a mind whose ravenous appetite is never satiated. As long as it has enough food, it will not leave even if you try to drive it away. Follow my advice and the state of your citta will never again deteriorate. Buddho is the key. So long as its food is there, it won’t stray. Do as I say and you’ll never again experience the disappointment of seeing your citta get worse time and time again.”
Buddho is something cool and calm. It's the path for giving rise to peace and contentment — the only path that will release us from the suffering and stress in this world.