Upper level: b126 Temperament and personality functions
(Sincerity)
Mental functions that produce personal dispositions such as in being hard-working, methodical and scrupulous, as contrasted to mental functions producing dispositions such as in being lazy, unreliable and irresponsible.
(additional explanation: The one to conflict with mental function to give birth to nature (negligence, reliable, and irresponsibility) by mental function to give birth to personal nature expressed diligent, steadily, and carefully. )