| driving force |
| antecedent(noun, cause, agent, originator) |
| author's purpose(noun, cause, agent, originator) |
| basis(noun, cause, agent, originator) |
| beginning(noun, cause, agent, originator) |
| causation(noun, cause, agent, originator) |
| consideration(noun, cause, agent, originator) |
| determinant(noun, cause, agent, originator) |
| end(noun, cause, agent, originator) |
| foundation(noun, cause, agent, originator) |
| genesis(noun, cause, agent, originator) |
| ground(noun, cause, agent, originator) |
| occasion(noun, cause, agent, originator) |
| origin(noun, cause, agent, originator) |
| root(noun, cause, agent, originator) |
| source(noun, cause, agent, originator) |
| spring(noun, cause, agent, originator) |
| want desperately(noun, excitement, enthusiasm, incitement) |
| account(noun, cause, agent, originator) |
| agency(noun, cause, agent, originator) |