The word Al-Khatm means the closing of the passageways to the heart and understanding.

The medium of understanding are the senses, as Allah U says:

﴾وَاللَّهُ أَخْرَجَكُمْ مِنْ بُطُونِ أُمَّهَاتِكُمْ لا تَعْلَمُونَ شَيْئاً وَجَعَلَ لَكُمْ السَّمْعَ وَالأَبْصَارَ وَالأَفْئِدَةَ لَعَلَّكُمْ تَشْكُرُونَ﴿

“And Allah has extracted you from the wombs of your mothers not knowing a thing, and He made for you hearing and vision and intellect that perhaps you would be grateful.” [Surah An-Nahl: 78].

The heart, hearing and sight are the tools of understanding. Through them, you hear and see the signs of Allah U, hear the call to Allah U and hear the Holy Qur’an and Hadeeth of Rasulullah r. These are the tools that human beings use to understand and attain belief.