As soon as he was well enough to write again, he began work on Time Enough for Love (1973), which introduced many of the themes found in his later fiction.
No, čim je ozdravio dovoljno da može pisati, počeo je rad na knjizi Time Enough for Love (Vrijeme dovoljno za ljubav, 1973), u kojoj je po prvi put spomenuo mnoge teme koje će se kasnije provlačiti kroz njegova djela.