No good thing {Psalm 84.11 memory verse}...

Psalm 84.11

Here's the problem with holding onto that verse: I don't always know what's good {for me}, and I'm completely incapable of walking uprightly on my own.

God doesn't make it difficult for me to know how to walk uprightly - in obedience to His commands and within the boundaries He has established in His Word and written on my heart - but it's a walk I'm powerless to make outside the blood-bought shield of grace and the mercies of each new day. 
...for all have sinned and fall short of the glory of God, and are justified by his grace as a gift, through the redemption that is in Christ Jesus, whom God put forward as a propitiation by his blood, to be received by faith. This was to show God's righteousness, because in his divine forbearance he had passed over former sins.
Romans 3:23-25