The 本有 means that original dharma is complete in each individual, the 眞如法性之德 the virtue of the bhūtatathatā dharma-nature, being 具足無缺 complete without lack; the 修生 means the development of this original mind in the individual, whether saint or common man, to the realization of Buddha-virtue; 由觀行之力, 開發其本有之德, 漸漸修習而次第開顯佛德也.

A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous

===（術語）謂本有與修生也。本有者，謂凡夫聖者，本來法爾，皆具足無缺，真如法性之德也，修生者。謂由觀行之力開發其本有之德，漸漸修習而次第開顯佛德也。

丁福保《佛學大辭典》