I Timothy 4

1 Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils;

2 Speaking lies in hypocrisy; having their conscience seared with a hot iron;

Seared Conscience:

1 Cauterize- destroy tissue by applying extreme heat, cold or caustic substance;

2 To deaden the feelings, make insensitive or to callous