Ibn AlQayyim (ra) said,
In the heart there is a dispersion that is not collected except by turning towards Allah..
And there is a loneliness that is not removed except by the company of Allah in seclusion..
And there is a sadness that is not pushed away except by the happiness of knowing Him and dealing with Him truthfully..
And there is an anxiety that is not stilled except by gathering yourself to Him and fleeing from Him to Him..
And there are fires of remorse, that are not extinguished except by contentment with His commands, prohibitions and decrees, and embracing patience regarding that until the time of meeting Him...
And there is severe desire, that will not cease until He alone becomes the desired..
And there is an emptiness, that is not filled except by His love and continuous remembrance of Him and sincerity to Him, and if one were to be given the entire world that emptiness would not be filled ever!