। ॥ ५२५ ॥
In plain words
One lamp is lit from another; that is how a son comes from his father. You can see the father's qualities in the child — seed, then sprout.
Close to the Sanskrit
As a lamp from a lamp, in just that way a son is born from the father — because of the observing, as with seed and sprout, of the father's qualities in the son.