By the profit of an offense, is to be understood, not merely the pecuniary profit, but the pleasure or advantage, of whatever kind it be, which as a man reaps, or expects to reap, from the gratification of the desire which prompted him to engage in the offense.
It is the profit (that is, the expectation of the profit) of the offence that constitutes the impelling motive, or, where there are several, the sum of the impelling motives, by which a man is prompted to engage in the offense. It is the punishment, that is, the expectation of the punishment, that constitutes the restraining motive, which, either by itself, or in conjunction with others, is to act upon him in a contrary direction, so as to induce him to abstain from engaging in the offense. Accidental circumstances apart, the strength of the temptation is as the force of the seducing, that is, of the impelling motive or motives. To say then, as authors of great merit and great name have said, that the punishment ought not to increase with the strength of the temptation, is as much as to say in mechanics, that the moving force or momentum of the power need not increase in proportion to the momentum of the burthen.IPML Chapter 14