When you are thirsty you feel it with every fiber of your body, you don't need to say it out loud. So, memorise some verses, but make sure you live them, don't just parrot them mindlessly.

“But I say unto you which hear, Love your enemies, do good to them which hate you, Bless them that curse you, and pray for them which despitefully use you.” - Luke 6:27-28 

 The little I've actually memorised I have memorised from school which was just parroting. It's only many years later that I've thought a bit about the words.