My Latin is okay reading Cæsar and Livy, and I'm even (mostly) fine reading Cicero's vicious attacks on the enemies of whoever happened to hire him for the occasion. But when I come to philosophy and politics, it's all ratio this and res that and condiciones and præstat and cursus and so on and so forth, and I feel like I'm swimming around in a sea of so many possible meanings that I can't figure out a single one to hold on to.
Are there any a) introductions to reading philosophical/political Latin or b) philosophical/political writings in which the Latin is more easily decipherable than in other writings of their ilk?