Final answer:
The signs that the Corinthians were still in the flesh included envy, strife, and divisions among them, indicating they had not fully embraced the spiritual teachings of Christ.
Step-by-step explanation:
A sign that the Corinthians were still in the flesh, according to the context of Christian teachings and the writings of the Apostle Paul, was the presence of envy, strife, and division among them. These indicated that they were behaving in a purely human way, not having fully embraced the spiritual teachings of Christ, which advocate for unity and love. The descriptions mentioned in your question do not directly indicate the states of being 'in the flesh' or 'in the spirit' from a Pauline Christian perspective, but they do relate to early Christian practices and the challenges faced by believers like Thecla in adhering to their faith amidst temptations.