Answer:
Use me to reward good behavior.
My second is performed by my first. A thief by the marks of my whole might be caught. What am I?
Sometimes dark and sometimes bright I make my way among twinkling lights. Seas and oceans obey my call yet mountains I cannot move at all. My face is marred and gray But I'm majestic anyway
The more of me you take, the more I appear behind you. What am I?
The more you have me, the less you see. Shine a light on me and I flee. What am I?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?