The greatest open door…

قال ابن القيم رحمه الله :

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‏الذكر هو باب الله الأعظم المفتوح بينه وبين عبده مالم يغلقه العبد بغفلته

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‏- مدارج السالكين

Ibn al-Qayyim رحمة الله عليه said:

Dhikr is the greatest open door (of opportunity to draw close to Allah) between Him سبحانه و تعالى and His slave, as long as the slave does not close it with his negligence.