Paul,
I agree. I think some Theosophists spend a great deal of time intellectualizing, when they need to spend more time reading devotional books like
At The Feet of the Master. I have seen the study of Theosophy turn into intellectual hair-splitting, which we need to do less of.
By they way, there is a book of commentary on
At The Feet of the Master. Thoughts on "At the Feet of the Master" by George S.Arundale
http://www.theosophical.ca/ThoughtsAtFeet1GA.htmThe whole purpose of Theosophy is to get us on the Path, through the Path, and into Adeptship.
You asked,
"Would I be correct in thinking that sorting out one's spititual and moral life is a prerequisite for any practical study of theosophy?"
--> Perhaps the two can be done simultaneously?
"Is it any more important than say intellectual capability and application or skills in yoga etc?"
--> I believe both are important.
"... is living a "clean life" the vital building block for a theosophical aspirant?"
--> Yes. The whole purpose of Theosophy is to show us how to change our lifestyle for the better.
I am reminded of a writing of Blavatsky's. She said that many people will find Theosophy unacceptable because it asks them to make many difficult changes in their life. (This, she said, is why our membership numbers are so small.) I believe she was right.