Light is something which travels very quickly. Like things are known by like things - if I know fire, fire is found in me, etc. The roots are eternal. In contrast with Parmenide's Entity which is homogenous and unchanging, Entity for Empedocles. is a mixture. All bodies are composed through segregation of the elemental substances.
Motion is explained through the forces of love and hate.
Authentic love is the attraction of dissimilarlties. The cycle repeats over and over. Only those which have a logos , a ratio, and internal structure which permits them to continue to exist, survive and propogate While various cycles occur in this way - the four roots remain eternal. Multiplicity is introduced into the Parmenidean Entity by dividing it into four elements. I would like to emphasize here two points.