Last week,I went to see my senior(in knowledge and age) to check my understanding of the meaning of the word yaqin after reading item #68 of the book Liberating The Soul written by Shaykh Nazim Adil al-Haqqani.Another reason why I went to see him was because he personally knows and has met the author of this book in person.
How could people say they believe in Allah and Qur'an and yet everyday they disobey the Commands of Allah and go on living against the Holy Book?IMHO, this may due to the level(maqam) of our yaqin.
Since I am not qualified to articulate the meaning of the word "yaqin",please let me share these few paragraphs from the the book Liberating The Soul and this link:
Certainty,yaqin,is the soul of beliefs.You may say,"Amantu bil-Lah,I believe in God,and in theangels,in the holy books,in the prophets,in the Last Day,in qadar."That is how a little boy begins school,saying,"A,B,C,D...",saying it without certainty,following his teacher.But afterwards,when he understands,he becomes certain that it is really "A" or "B" or "C".
Therefore,it is important for everyone to make himself improve in certainty,not remaining as he is.Everyone knows something,but not everyone has certainty about what he knows.Certainty comes through the heart of the Prophet(SAW).
Let's improve our knowledge and ubudiyyah and ask the Mercy of Allah swt to bestow yagin in our hearts,insyaAllah.
Please click and read the this link to read more about the meaning of yakin.
Note on photo: I took this photo of the shouq behind Masjid Syaidina Ali.