The fear of speculation, the ostensible rush from the theoretical to the practical, brings about the same shallowness in action that it does in knowledge. It is by studying a strictly theoretical philosophy that we become most acquainted with Ideas, and only Ideas provide action with vigour and ethical meaning.
"Lectures on the Method of Academic Study" by Friedrich Wilhelm Joseph Schelling, translated by E. S. Morgan, edited by Norbert Guterman, 1966.