Abu Muhammad al-Jariri, described as Junayd's chief companion and designated successor, taught that the permanence of faith, the sustenance of religion, and the wellness of the body rest on three qualities:

• Sufficiency (iktifa): whoever finds all-sufficiency in God alone gains a sound inner self (sarira), whose fruit is the purity of gnosis (ma'rifa).
• Piety / god-fearing (ittiqa): whoever guards against what God has forbidden gains upright outward conduct (sira), whose outcome is good character.
• Abstention (ihtima): whoever abstains from what does not agree with the self disciplines his own nature (tabi'a), whose goal is a balanced temperament.

The doctrine frames spiritual health as an inner-to-outer progression, moving from reliance on God, to disciplined conduct, to a balanced nature.