Why not let Heinlein talk to you?
The NPR folks reviving the old "This I Believe" radio program have made Robert Heinlein's 1952 essay available on streaming audio.
I knew this tape existed in an archive, but I'd never heard it until I attended the Heinlein conference last summer.
I believe that this hairless embryo with the aching oversized braincase and the opposable thumb—this animal barely up from the apes—will endure, will endure longer than his home planet, will spread out to the other planets—to the stars and beyond—carrying with him his honesty, his insatiable curiosity, his unlimited courage, and his noble essential decency. This I believe with all my heart.
Update: I need to check this, but it looks like the MP3 can be downloaded directly from
Further Update: The URL has been changed since I posted this last night. Possibly the webmaster at thisibelieve.org doesn't want us to download the MP3, for some reason. (But what reason?) I hope I am not violating some unknown etiquette by providing the new URL here: http://www.thisibelieve.org/audio/TIB1950_HeinleinR.mp3.