Fear:
s4e21 Picard: "Spreading fear in the name of righteousness"
s4e26 Gaoron: "And fear is power".

Moral duty:
s4e21 Picard: "What you're doin' here is unethical. It's immoral. I'll fight it.

Truth/Lies:
s4e25 Data: "There seem to be a recurrent motif". (Omicorn/Delta?)
s4e26 Picard: "It's a lie, lies must be challenged".
s5e1 Picard: "Doubts, I'm full of them but nothing you told me can persuade me that this is true".
Disillusionment:
s4e24 La Forge: "I'm just not sure. About anything." Counselor Deanna Troi: "Believe it or not, that's a good sign. A beginning."

Please compare:
s5e1 Picard: "Claim I was just following orders was used too many times through human history