Is there a reliable original source

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[Krystal Locke]

for the aikido meme/dojokun/?? about "train in the spirit of joy"?

I'd like to see O-sensei's original kanji for that.

[Dan Rubin]

I don't know if this is "O Sensei's original kanji":

http://www.aikiweb.com/forums/showthread.php?t=19487

[Peter Goldsbury]

I quoted two versions of this from the Japanese original of Budo and from the Japanese original of 『規範合気道基本編』. I did this fairly recently, so they should be relatively easy to locate. I think they are as original as any written discourses of Morihei Ueshiba are likely to be.

Best wishes,