Hüseyin Hilmi Işık "rahmatullahi aleyh" published the book "Seâdet-i Ebediyye" in 1956. With the encouragement of those who read the book Seâdet-i Ebediyye, he prepared the second part. This, too, was suppressed in 1957. These two books aroused such an interest and attraction towards Islam in the pure youth that he was left under the rain of questions. In order to answer these various questions, he published the third part in 1960, with explanations and additions translated from reputable books. He brought these three books together in 1963 and named it "Full Catechism".
Hüseyin Hilmi Işık "rahmatullahi aleyh" founded Işık Bookstore in 1966 so that the book "Seâdet-i Ebediyye" could be easily printed and distributed, and later changed its name to Hakîkat Bookstore.
Due to the relevance of the book "Seâdet-i Ebediyye" and the constant questions, he made new additions to each edition of his book and created a 1248-page unique work. The work was translated into English and published as "Endless Bliss" in six volumes by Hakîkat Publishing House.
In the following years, new editions of the book "Seâdet-i Ebediyye" and other Arabic, Persian and Turkish books written by Hüseyin Hilmi Işık "rahmatullahi aleyh" were translated into dozens of different languages and continued to be published by our bookstore.
Hüseyin Hilmi Işık "rahmatullahi aleyh" created translations and compilations from the most valuable books and copyrighted works, and he pioneered the spread of this belief by explaining the belief of Ahl al-Sunnah wal Jamaat in a plain language. He introduced Islam to people all over the world, and spread hundreds of Arab and Persian works, which were approved and praised by scholars of Ahl as-Sunnah, to the whole world through Hakîkat Bookstore. He revived forgotten sciences by writing thousands of issues in Seâdet-i Ebediyye and other books. He wrote at length the fards, wâjibs, sunnats, and even mustahabs, keeping in mind the hadîth-i-sherîf, "When my ummah is corrupted, the reward of a hundred martyrs will be given to those who revive it." He used to say that all these services were due to the savings and patronage of Sayyid Abdulhakîm-i Arvasi and the abundance of his extreme love and respect for Islamic scholars.
He would not shy away from writing the truth in his books, he would say, "It is only Allahu ta'ala to be afraid of," but he would be very careful not to cause strife. He was very meticulous in obeying the laws of the state. He used to say, "Muslims follow religion, do not sin; obey the laws and do not commit crimes." He would often read the hadith-i sherîf "Love for the homeland is from faith".