Help! Any of you literature buffs out there. Trying to find a quote from Mark Twain about making money.?

Question

Quote goes something like this, good entrepreneurship, buy an addictive substance and charge double for it.

Answer 1

All Mark Twain:

"It could probably be shown by facts and figures that there is no distinctly native American criminal class except Congress."

"There comes a time in every rightly constructed boy's life that he has a raging desire to go somewhere and dig for hidden treasure."

"Let your secret sympathies and your compassion be always with the under dog in the fight -- this is magnanimity; but bet on the other one -- this is business."

"Power, money, persuasion, supplication, persecution -- these can lift at a colossal humbug -- push it a little -- weaken it a little over the course of a century; but only laughter can blow it to rags and atoms at a blast. Against the assault of laughter nothing can stand."

"The holy passion of Friendship is of so sweet and steady and loyal and enduring a nature that it will last through a whole lifetime, if not asked to lend money."

"I am opposed to millionaires, but it would be dangerous to offer me the position. "

"Honesty is the best policy - when there is money in it. "

"The lack of money is the root of all evil. "

"Some men worship rank, some worship heroes, some worship power, some worship God, & over these ideals they dispute & cannot unite — but they all worship money. "

Answer 2

Try this site:

Answer 3

Figure out what you like to do best and get someone to pay you for it.  That came to my head right away but I am not 100% sure if it is Twain.