Chitra means wondrously conspicuous, and Gupta means hidden or secret. We can interprete Chitragupta to mean: Hidden in plain sight.
Chitragupta is the cosmic accountant of our deeds, good and bad, in body, speech and mind.
He represents our conscience. Our conscience is hidden from others, but in plain view to us for we always see our own minds.
If our conscience is pure, it is due to our honesty, good-will, trustworthiness, selflessness, and charity in dealing with others, both personally and in our business dealings.
If our conscience is impure, it is due to the opposite of these qualities, which is ego-driven.
The practice of Self-inquiry, does, by its very nature, bring about the investigation of impure vasanas and destroys the egocentric tendencies that would cause them, thus making our conscience pure, which is fundamental to our emancipation.
This is why Chitragupta is an important symbol in our temple.