That Rembrandt did make considerable progress during the following three years is, of course, certain; and when his apprenticeship drew to an end the question arose as to what was to come next. The experience of a young fellow-artist probably suggested the answer. About the time Rembrandt entered Swanenburch's studio Jan Lievensz, a fellow-citizen, a year younger than Rembrandt, who had, however, entered upon his artistic studies while Rembrandt was still struggling with, or against, the detested Latin, returned from completing his studies in the studio of Pieter Lastman at Amsterdam. The father of Jan was a farmer, a man in the same rank of life as Hermann the miller, and probably had business connections with him, so that the acquaintanceship between the two sons, destined to ripen into warm friendship, doubtless began in early boyhood.
Certain it is, at any rate, that when Jan returned from Lastman's studio to astound his townsmen with his precocity, the intimacy between him and Rembrandt became close; in a few years their names seem to have become as inseparable as those of Damon and Pythias, and it was no doubt from the enthusiasm of Lievensz that the impulse arose which, in 1624, sent Rembrandt also to study under Lastman. The experiment, however, was not a success. Lievensz had remained with him two years; Rembrandt wearied of it in six months. And, truly, though he enjoyed at that time an incomprehensibly large measure of popularity and success, Lastman, though a far better artist than Swanenburch, was not one of those whose names we nowadays inscribe on the roll of great painters. He had been, moreover, one of the large group who had trudged to far-away Rome, and come under the influence of Elsheimer there, and the exotic and ill-adapted traditions and conventions of the school were not calculated to appeal to so ardent and eager a seeker after truth as Rembrandt. He wanted to find nature, and was not to be put off by a diluted semi-Italian imitation of it; and so, after a few months' trial, he packed up his paints and canvases, and returned to his family in Leyden "to study and practise painting alone and in his own way," to quote again the garrulous Orlers.