This is a theme with me --
the pros and cons (there aren't many cons) of learning foreign languages.
Also, how does it actually work?
Why is one language easier for a given person to learn than another?
Also, what's the relatiion between learning a language to read,
and learning a language to speak?
And why is psychology so important, personal psychology,
in the acquisition of a foreign 'tongue'?
Here is 50 years' experience of pain and suffering (and altered states)
rolled up into a single half hour.