Worshiping anything other than Allah is a tragedy that results not only in the loss of freedom (by worshiping anything other than Allah, man becomes enslaved to Satan, who is himself a creature, and becomes harnessed to his own baser qualities); its serious effect reaches man's mind and destroys it as well. Almighty Allah created man and his mind with its purpose set on achieving knowledge, the most important of which is that Allah alone is the Creator and all the rest are worshipers (slaves). Therefore, disbelief in Allah, or polytheism, results in the loss of freedom, the destruction of the mind, and the absence of a noble target in life.
Related Quran Ayaaths of this Hadith.
Surah 6 : Ayah 84 Surah 4 : Ayah 163 Surah 11 : Ayah 25 Surah 11 : Ayah 32 Surah 11 : Ayah 36 Surah 11 : Ayah 40"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari