invoke- to call upon (for inspiration) from another source usually a higher power; to cite as an authority.
When using invoke think of prayer or even magic. You can invoke the memory of someone or some instance to make a point.
evoke- to call forth a feeling, emotion or memory
* Many American candidates invoke the horrors of 9-11 in order to evoke the feeling of patriotism.
provoke- similar to evoke but in a more negative connotation usually used in reference to bringing up anger or starting a fight.
* Don't listen to that jerk he's just trying to provoke you. (into a fight)