The simple fact was that he had became love-sick. His separation from Jenny von Westphalen had made him conscious of a feeling which he had long entertained without knowing it. They had been close companions. He had looked into her beautiful face and seen the luminous response of her lovely eyes, but its meaning had not flashed upon his mind. He was not old enough to have a great consuming passion, he was merely conscious of her charm. As he could see her every day, he did not realize how much he wanted her, and how much a separation from her would mean. As "absence makes the heart grow fonder," so it may suddenly draw aside the veil behind which the truth is hidden. At Bonn young Marx felt as if a blaze of light had flashed before him; and from that moment his studies, his companions, and the ambitions that he had hitherto cherished all seemed flat and stale. At night and in the daytime there was just one thing which filled his mind and heart--the beautiful vision of Jenny von Westphalen. Meanwhile his family, and especially his father, had become anxious at the reports which reached them. Karl was sent for, and his stay at Bonn was ended. Now that he was once more in the presence of the girl who charmed him so, he recovered all his old-time spirits. He wooed her ardently, and though she was more coy, now that she saw his passion, she did not discourage him, but merely prolonged the ecstasy of this wonderful love-making. As he pressed her more and more, and no one guessed the story, there came a time when she was urged to let herself become engaged to him. Here was seen the difference in their ages--a difference that had an effect upon their future. It means much that a girl should be four years older than the man who seeks her hand. She is four years wiser; and a girl of twenty is, in fact, a match for a youth of twenty-five. Brought up as she had been, in an aristocratic home, with the blood of two noble families in her veins, and being wont to hear the easy and somewhat cynical talk of worldly people, she knew better than poor Karl the un-wisdom of what she was about to do. She was noble, the daughter of one high official and the sister of another. Those whom she knew were persons of rank and station. On the other hand, young Marx, though he had accepted Christianity, was the son of a provincial Jewish lawyer, with no fortune, and with a bad record at the university. When she thought of all these things, she may well have hesitated; but the earnest pleading and intense ardor of Karl Marx broke down all barriers between them, and they became engaged, without informing Jenny's father of their compact. Then they parted for a while, and Karl returned to his home, filled with romantic thoughts.