Envisagers
The Envisagers were a group of people who secretly bore the remembrance of the Knights Radiant and awaited their return.[1] Currently there are no living Envisagers known,[2] although they could potentially still exist in Yulay, as Sigzil speaks of a group there with similar goals.[3]
Knights Radiant
They believed in the Knights Radiant, their way of life, the Immortal Words, the Ideals, and also in the Almighty, and even in old Vorinism.[4] They knew the Immortal Words and the Ideals of the Knights Radiant.
Teft
Teft's parents were part of the Envisagers. Contrary to his parents Teft thought it nonsense and left the sect.[1] He didn't believe until he saw Kaladin infusing Stormlight.[2] Unfortunately Teft couldn't seek advice from them, because he caused their deaths.[2]
Quotes
“The Envisagers were gone. Dead, because of what he had done. If there were others, he had no idea how to locate them.”