James 4:7 tells us to "resist the devil and he will flee from you."
Well, how do we resist lies?
The most succinct answer I ever heard... name the lie, insert the truth.
Lie - you're not good enough. you're a failure.
Truth - God knows me and loves me "How precious about me are your thoughts, O God! How vast is the sum of them!" (Psalm 139:17)
Lie - nobody will know. just try it.
Truth - "Your sin will find you out." (Numbers 32:23)
Lie - nobody cares about you.
Truth - Indeed the very hairs on your head are numbered. You are much more valuable than the sparrows which God cares for. (Luke 12:7)
Lie - you're not gonna make it. you're running out of money. do something drastic. worry worry worry!
Truth - "If God so clothes the grass, whcih is alive in the field today and tomorrow is thrown into the oven, how much more will he clothe you, o you of little faith! and do not seek what you are to eat and drink... your Father knows you need them. Instead, seek his kingdom, and these things will be added to you." (Luke 12:28-31).
See how it works? Identify the lie and insert the truth.