| driving force(noun, expression, impetus) |
| cause(noun, cause, start, reason, object) |
| motive(noun, cause, start, reason, idea) |
| source(noun, cause, start, reason, idea) |
| fountain(noun, cause, connection, source, spring) |
| ground(noun, cause, start, reason, base) |
| spring(noun, cause, reason, idea, object) |
| basis(noun, cause, start, reason, idea) |
| inspiration(noun, cause, influence, reason, reservoir) |
| intention(noun, feeling, cause, reason, object) |
| origin(noun, cause, start, reason, base) |
| principle(noun, cause, reason, idea, base) |
| reason(noun, feeling, cause, start, object) |
| root(noun, cause, reason, idea, object) |
| grounds(noun, cause, reason, object, element) |
| keystone(noun, idea, essential, foundation, essence) |
| motivator(noun, cause, incentive, motive, instigator) |
| waterfall |
| wellspring(noun, cause, source, spring, stream) |
| action(noun, cause) |