As a fellow language lover I second the suggestion, but not the reasoning. What's your evidence for "some thoughts only make sense in a given language"? From what I've read, this isn't agreed upon in the linguistic community. As for Esperanto, it's heavily biased towards Western speakers, so it wouldn't necessarily be easy to start with for someone whose native language is non-Western.
On the most superficial level:
It's easier to talk about snow or numbers in languages that have more words for these concepts than in languages that have less.
