But when He giveth them a goodly child, they ascribe to others a share in the gift they have received: but Allah is exalted high above the partners they ascribe to Him.
“Although Sufi commentators agree that the truly great sin is shirk (idolatry), they consider shirk to also mean an excessive attachment to worldly things, and even the assertion of the independent existence of one’s own soul in a way that would obscure pure devotion to and utter reliance upon God. Hence the Sufi saying, sometimes attributed to Rābiʿah al-ʿAdawiyyah (d. 183/801): “Your existence is a sin to which no other sin can be compared!” (K, Qu).”
Nasr, Hossein (2015). Study Quran. http://www.islamicweblibrary.com/wp-content/uploads/2020/04/TheStudyQuran.pdf