Anyone who purifies himself/ herself will succeed
Purity is the essence of religion.
Imagine that your body or clothes have dirt on them. Any sane person would definitely like to clean and purify his body and clothes.
Similarly the purity of thought and belief is crucial to the persons physical and spiritual well-being. Purity of belief is our right understanding of our Creator and our obligation to worship Him alone, without associating any partner to Him in worship. He created us and all the people before us.
No created thing like the sun or the moon or the river or the tree, animal or man ( living or dead ) has the right to be worshiped as all of these were created by the Creator alone. When anyone worships other than the Creator anything or anybody else, they make their religion impure. This leads to an eternal loss and punishment by fire.
On the contrary when a person worships the Creator, the one and only, without associating any partner to Him in worship, they purify their religion, leading to an eternal reward and gardens of paradise.
As Allah, The Creator says in the Quran: "He/ she will succeed who purifies himself/ herself, And remembers his/ her Lord and prays."
May Allah, guide us all to the straight path and help us purify ourselves. Ameen.