But the principal means by which the current of his thoughts was changed was never dreamed of by himself or by his friend when they left Illinois. During this visit Speed himself fell in love, and became engaged to be married; and either by a singular chance or because the maladies of the soul may be propagated by constant association, the feeling of despairing melancholy, which he had found so morbid and so distressing an affliction in another, took possession of himself, and threw him into the same slough of despondency from which he had been laboring to rescue Lincoln. Between friends so intimate there were no concealments, and from the moment Lincoln found his services as nurse and consoler needed, the violence of his own trouble seemed to diminish. The two young men were in Springfield together in the autumn, and Lincoln seems by that time to have laid aside his own peculiar besetments, in order to minister to his friend. They knew the inmost thoughts of each other's hearts and each relied upon the honesty and loyalty of the other to an extent rare among men. When Speed returned to Kentucky, to a happiness which awaited him there, so bright that it dazzled and blinded his moral vision, Lincoln continued his counsels and encouragements in letters which are remarkable for their tenderness and delicacy of thought and expression. Like another poet, he looked into his own heart and wrote. His own deeper nature had suffered from these same fantastic sorrows and terrors; of his own grief he made a medicine for his comrade.