Answer
"Look before you leap." means you shouldn't act without first considering the possible consequences or dangers. "You can't teach an old dog new tricks" means that it is challenging to teach a person something new things. Most likely that person has been doing things a certain way for so long that they're too stubborn to learn how to do it differently.
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One theme from Rikki Tikki Tavi would be courage. Rikki has to fight<span> two cobras, Nag and Nagaina, to protect his garden and Teddy. He is frightened of them because they are stronger and bigger than he is, but he overcomes his fear and fights them anyway.</span>