Yet another quality of physics, likewise all-pervasive and permanent, is the mocking, paralyzing mystery in which all its certainties are veiled. The mighty acquisitions to our certain knowledge in the realm of nature are superbly manifold and as superbly sure. The swelling catalogue of things well certified in the material world seems to advance the modern scientific mind almost to genuine apotheosis. But of all these stately certitudes there is not one but walks in darkness no human eye nor thought can penetrate. Before heroic and unexampled diligence and daring the scientific frontiers are receding everywhere; but only to make still more amazing and unbearable their inscrutability. On every horizon of the physical realm yawn infinitudes, whether of space or time, of geometry or arithmetic, of electron or of cell, so defiant, so bewildering, and so overwhelming in their complete defeat and mockery of our bravest and best intelligence that our proudest powers are palsied utterly. Whichever ways we turn, whatever gains we win, we face at last, in the very eye of our research, and in the very heart of our desire, a changeless silence that mocks all hope, and leaves us standing in an utter void. In the realm of simple physics the human intellect, despite the fact that in the physical realm the mind of man has triumphed gloriously, is faced forever with the taunting consciousness that its primal task is still undone. In an undertaking such as this, and in such a hapless outcome, the mind and life of Lincoln could never be engrossed. He was ever facing mystery indeed in the perplexities that throng the moral realm. In fact, in the darkness and confusion that enshroud and mystify the world of duty and award were all his sorrows born. But in those mysteries moral honesty is not mocked. Where iniquities prevail, the soul that bows towards God sees light. Where sin abounds, the heart that yields the sacrifice of penitence finds peace. In the face of hate and strife and bloodshed, to banish malice and to cherish charity is to enter and to introduce complete tranquillity. Where lives grow coarse and souls are base and purity is all denied, the soul that seeks refinement grows refined and consciously approaches God. When God is mocked and scorners multiply and hearts grow hard in pride, the heart that meekly, humbly holds its confidence in the transcendent, all-controlling Deity opens in that lowly faith deep springs of never-failing hope. In these mysteries, however baffling and persistent, these efforts towards relief find sure and great reward.