Strength of Faith
In justification the strength of the faith does not matter but rather the strength of its object, namely, the person and work of Christ. As faith pertains to sanctification, a weaker faith will lead to a weaker state of sanctification, and contrariwise a stronger faith is correlative to a stronger state of sanctification.
John Fesko. The Giver of Life: The Biblical Doctrine of the Holy Spirit and Salvation (p. 238). Lexham Press. Kindle Edition.