Honesty is the best policy.
One of friends was very cheery that day because the vendor made a mistake. He added the price of groceries as ₹345 in spite of ₹435 and returned ₹90 extra.
I was pissed off.
Never enjoy of what you are not worthy.
It makes you a cheater. You are dishonest inside.
Never compromise with your character. If you fall once, it will become your habit. You will start enjoying the grey money. You will always wish to get that something extra.
If you want to get more, work more. You have to give more, invest more to earn more.
Honesty is the best character; it was always, it will be always.