He therefore began to make designs, and sent for some of his boyhood friends to aid him, Granacci and others. His method was to make the first draught in red or black chalk on a very small scale. From this he marked out the full-sized cartoons or working drawings, nailing these to the wall, and cutting away the paper around the figures. He soon found that his assistants were a hinderance rather than a help, and, unable to wound their feelings by telling them, he shut up the chapel and went away. They understood it, and, if some were hurt or offended, Granacci was not, but always remained an earnest friend. Michael Angelo now worked alone, seeing nobody except his color-grinder and the pope. His eyes became so injured by holding his head back for his work that for a long period afterwards he could read only by keeping the page above his head. After he had painted for some time the walls began to mould, and, discouraged, he hastened to the pope, saying, "I told your Holiness, from the first, that painting was not my profession; all that I have painted is destroyed. If you do not believe it, send and let some one else see." It was soon found that he had made the plaster too wet, but that no harm would result. He worked now so constantly that he scarcely took time to eat or sleep, and became ill from overexertion. In the midst of his labors and illness, he writes his father, "Do not lose courage, and let not a trace of inward sadness gain ground in you; for, if you have lost your property, life is not lost, and I will do more for you than all you have lost. Still, do not rely upon it; it is always a doubtful matter. Use, rather, all possible precaution; and thank God that, as this chastisement of heaven was to come, it came at a time when you could better extricate yourself from it than you would perhaps have been earlier able to do. Take care of your health, and rather part with all your possessions than impose privations on yourself. For it is of greater consequence to me that you should remain alive, although a poor man, than that you should perish for the sake of all the money in the world. Your MICHAEL ANGELO." He writes also to his younger brother, Giovanni Simone, who appears to have spent much and earned little: "If you will take care to do well, and to honor and revere your father, I will aid you like the others and will soon establish you in a good shop.... I have gone about through all Italy for twelve years, leading a dog's life; bearing all manner of insults, enduring all sorts of drudgery, lacerating my body with many toils, placing my life itself under a thousand perils, solely to aid my family; and now that I have commenced to raise it up a little, thou alone wishest to do that which shall confound and ruin in an hour everything that I have done in so many years and with so many fatigues."