Once a man wrote a letter in which he mentioned that before he went for Hajj, he used to cry a lot; since he had come back, he was no longer able to cry. Due to this change, he was feeling depressed with the thought that perhaps his spiritual self had deteriorated from what it previously was.
Moulana Ashraf Ali Thanwi saheb replied to this man that there is one kind of crying that is from the eyes; this is not in ones control, and its not being in ones control should not be a source of concern.
The other kind of crying is that from the heart, and this was the kind of crying that the author of the letter was experiencing; his being depressed over lack of tears was proof of this.
So, in reality there was actually no need to be worried.
Adapted from Malfoozat Hakeemul Ummah
vol 12, pg 39