Spinoza

Baruch (Benedict) Spinoza 1632 – 1677

Accordingly, as in all sciences, which have a useful application, so especially in that of politics, theory is supposed to be at variance with practice; and no men are esteemed less fit to direct Republic than theorists or philosophers.

Cum igitur omnium scientiarum, quae usum habent, tum maxime Politices Theoria ab ipsius Praxi discrepare creditur, et regendae Reipublicae nulli minus idonei aestimantur, quam Theoretici, seu Philosophi.