Sean J. McGrath 
Philosophical Foundations of the Late Schelling [PDF ebook] 
The Turn to the Positive

This is the first major effort to systematically organise and evaluate Schelling’s arguments for a Philosophy of Revelation and to demonstrate their importance for contemporary debates in speculative realism, new realism and post-secularism. Schelling’s decisionism has long been recognised as the historical root of European existentialism, but has never been properly explained as a philosophical strategy. According to Mc Grath, Schelling’s turn to the real is neither fideistic nor absurdist, but the consequence of the free decision of the philosopher who has soberly assessed the results of logic, nature-philosophy and epistemology.