Imputed righteousness is secured by our believing.
That same believing continues to secure imputed righteousness.
How do I access this Jesus who maintains us?
That's right.
It's the one and only believing that you started out with in the beginning.
It isn't new, or additional, or different believing.
It's the very same believing you started out in, uninterrupted and continuing.
That believing that you started out in must continue for you to continue to have the salvation that believing secures for you:
"... you are saved, if you hold fast the word which I preached to you..." - 1 Corinthians 15:2
"14 For we have become partakers of Christ, if we hold fast the beginning of our assurance firm until the end" - Hebrews 3:14
So, according to the scriptures above, am I saved partaker of Christ if I do not hold fast the believing I started out with?
Okay, then what must I do to trust Him?