Pele Yoetz (Pesach) writes, "The mekubalim write that it isn't solely chametz which is so severe on Pesach, rather every aveirah is far worse when committed on Pesach."
Reb Meshulem Igra zt’l was extremely machmir and cautious regarding chametz on Pesach. Therefore, he only ate matzah at the seder, and he ate solely the matzah that he baked on his own, with great caution to be free from chametz.
Once, on erev Pesach, Reb Meshulam Igra's children were hungry. His rebbetzin wasn't around at the time, and the maid sought something to give the children. The chametz was already burned, so that wasn't an option. She found some matzah, not realizing that these were Reb Meshulem Igra's special matzos, and she gave them to the children.
Soon, the rebbetzin discovered what happened, and she was worried that her husband would be upset. So, she left the house and returned home just in time for the Seder. She didn’t want to be home when her husband discovered his matzos were gone because she knew how upset he would be. She found her husband in happy spirits. "He probably doesn’t know yet," she thought. With tears in her eyes, she told her husband that the maid had mistakenly given away his matzos.
He said, "So what's the problem? There are other matzos in the house. I'll use those."
The Satmar Rebbe zt'l repeated this story and expressed his admiration and wonder that Reb Meshulam Igra was able to pass this difficult test. He didn’t become angry with the maid (or his wife for not being more on top of things). He believed this was meant to be, so there was no reason to be angry.
Rebbe Pinchas Koritzer's son once became angry with his maid because she had put matzah in the soup, rendering the soup and the matzah gebroks. Rebbe Pinchas Koritzer rebuked his son, saying, "Now you can eat this matzah too." He taught his son that getting angry and insulting others is worse than gebroks.
