Full Idea
Whatever a man does, good or bad, in thought, word or deed, has these five sources of action: the body, the lower 'I am', the means of perception, the means of action, and Fate.
Gist of Idea
All actions come from: body, lower self, perception, means of action, or Fate
Source
Anon (Bhag) (The Bhagavad Gita [c.500 BCE], 18.14/15)
Book Reference
'The Bhagavad Gita', ed/tr. Mascaro,Juan [Penguin 1962], p.116
A Reaction
The 'means of action' will presumably take care of anything we haven't thought of! Nothing quite matches the idea of 'the will' here. A twitch from the first, eating from the second, a startled jump from the third, struck by lightning from the fifth.