How do children develop a conscience?

It is just like this—

Children who have been through certain experiences before they took on physical life are unconsciously to the physical mind linked and bound to their heavenly home, and although there may be dissuasive voices, although there may be a multitude of distractions, yet right through the only happiness for them is unity with their real home—the linking up of the divine within and without.

—Zodiac, the Christ Messenger