(Ibn al-Qayyim, Madārij al-Sālikīn 3/156)
In the heart there is disarray, and nothing gathers it except turning attentively toward Allah.
In the heart there is estrangement, and nothing removes it except closeness with Allah in seclusion.
In the heart there is sorrow, and nothing dispels it except the joy of knowing Allah and sincerity in dealing with Him.
In the heart there is anxiety, and nothing calms it except devotion to Allah and fleeing from that anxiety to Him.
In the heart there are flames of regret, and nothing extinguishes them except contentment with His command, His prohibition, and His decree — along with embracing patience upon that until the time of meeting Him.
In the heart there is an intense seeking, which does not stop until Allah alone becomes the ultimate one of pursuit.
In the heart there is poverty (neediness), and nothing fills it except the love of Allah, turning back to Him, constant remembrance of Him, and true sincerity for Him. Even if a person were given the whole world and everything in it, that poverty would never be satisfied.