See also
http://www.buddhadust.org/dhammatalk/dhamma_talk/pajapatis_problem.htm
It's not really about our problem here, but the beginning is also about
vitakka and vicara. Anyway it makes an interresting read, also in
combination with
http://www.buddhadust.org/dhammatalk/sitting_practice/koan_n_samma_ditthi.ht
m

Lars