The difference between "authentic faith" and a "trust in their own understanding" has huge ramifications on how our "faith" is lived out and therefore passed on.
Biblical principles are made alive by the Holy Spirit as one realizes their need to be guided. Thus knowledge is acquired... If a man knows to do good and doesn't do it, that is sin
The problem is when we trust in our own understanding. (Prov. 3:5-6)
Faith implies a present-tense relationship with God. Present-tense is used in grammar for actions that are happening now. We reside/exist in the Now, and so does our relationship with God. It is impossible to have "Faith" in God without a relationship with Him where His presence is experienced in the present.
We think that we have the ability to anticipate the contingencies that our choices will propagate. But we forget "we see through a glass darkly"! Our perspective and therefore our understanding is limited. But God's is not.
Romans 8:14 For all who are led by the Spirit of God,
they are the children of God.