He was a classical scholar little known except for his treatise on universal peace entitled The New Cineas which was published in 1623 with a second edition in 1624. This work is the first practical proposal for world peace which does not aggrandize the power of a particular nation, empire, or religion. He wrote during the early years of the Thirty Years' War, and his ideas probably influenced the Peace of Westphalia in 1648. He addresses himself to the current monarchs and sovereign rulers, and clearly his method is to reason with them and institute his program from the top down. Actually there is more dishonor than honor to be found in war - insults and scorn to prisoners and ignominious death.
Princes ought to be ashamed of warmongering and curtail their ambition.
As for profit, more often than not the costs of war are tremendously expensive even for the winning side. Long possession indicates God's favor, and therefore conquest is not just. Instead of resorting to arms to settle disputes, they ought to submit their cases to arbitration by sovereign rulers not involved in the particular case. The danger of war due to restless activity requires several remedies. First the sovereigns must maintain control of their armies and not let the militarists take over.