[zladuric]

Hi, that's a nice book reference. I've ran into this thread a bit late, but do you know if that book is still relevant (it's published in 1936, Wikipedia says) or are there more modern works that incorporate those ideas and work with them?

[retreatguru]

It is still relevant, They updated the copy in 1985 to keep it modern but also true to the original. The straightforward message of that book is as powerful as ever.