A practised ear easily discerns the coexistence of these various tones when a pianoforte or violin string is thrown into vibration.
As a metaphysician he starts from what he terms "the higher scepticism" of the Hume-Kantian sphere of thought, the beginnings of which he discerns in Locke's perplexity about the idea of substance.
The intellect is a cleaver; it discerns and rifts its way into the secret of things.
You will also read a "level", which discerns for you ahead of time how much dance experience is expected to pull off the dance correctly after a few practice runs.