In the article, I examine the presence and importance of intuitive cognition in mathematics. I show the occurrence of mathematical intuition in four contexts: discovery, understanding, justification, and acceptance or rejection. I will deal with examples from the history of mathematics, when new mathematical theories were being created (the end of the nineteenth and the beginning of the twentieth century will be particularly important, including the period of establishing the Polish mathematical school). I will also refer to the research (mainly) of Polish philosophers and mathematicians in this field. The goal of the article is also an attempt to understand the breakthrough that took place in mathematics at the turn of the nineteenth centu...