Cognates are a pair of Telepaths who work together. They can achieve things that a single Telepath cannot by combining their energy and and balancing each other's personality . Cognates are required to share everything with each other and their bond is based on trust. The special bond between Cognates is strong, but can be broken if the trust between the two is breached. It is very rare for a Telepath to find their desired match, much less achieve Cognatedom.
Note: There is an even higher level of trust; however, this is the highest level that both members are only themselves, and not another as well. For example, Mr. Forkle and his deceased twin were pretty much two bodies with one soul