In your mental illness, would you lie? Lie to get what you want? The answer is yes.
So, when you do not have mental illness and just want to get what you want, do you lie?
What is a good lie? What is a justified lie?
Some say a lie is a lie. So, when you want to get what you want so badly and think you are in the right, do not lie! Tell the truth. Do not try to hide what you really want! Because SELFISH desires are directed to sinful acts, such as lying!
You will answer to God ultimately!
This is simple?
Conclusion: BASE your wants on Truth! not Lies!