Use commas before and after "therefore".
Compare
- To compare to is to point out or imply resemblances between objects regarded as essentially of a different order;
- to compare with is mainly to point out differences between objects regarded as essentially of the same order.
- Thus, life has been compared to a pilgrimage, to a drama, to a battle; Congress may be compared with the British Parliament. Paris has been compared to ancient Athens; it may be compared with modern London.
