Brought Their Hearts Together

Who among us has not mistakenly attributed a creatures' actions to himself?  Who has not thought- 'Oh that guy did that to me!' or 'That woman refuses me...'

But then what is the meaning of the verse:

...And brought their hearts together.  If you had spent all that is in the earth, you could not have brought their hearts together, but God brought them together.  Indeed, He is Exalted in Might and Wise.

Think again when you look at any created thing as having causal power.