Imaam Ibnul Jawzee (rahimahullaah) said:
Indeed the listener is aroused at the time of hearing admonitions; but when he leaves a gathering (in which) Allaah is remembered he returns to a (state) of impenitence and heedlessness. So I pondered and came to know of its causes and I saw that the people were in different (states) in that regard. And the general state of affairs is that the heart does not remain upon a distinct state of wakefulness after one hears an admonition, and this is due to two reasons:
An admonition is like a whip, and a whip does not cause harm after its use ceases. Its pain is (felt) at the time it is used.
In a state of listening to admonitions a person may be withdrawn from (worldly influences)—his body and thoughts are deserted by the influences of the worldly life and he pays attention with his heart; but when he returns to the (worldly) preoccupations, he is captivated by its hassles. Therefore, how can he be as he was (during the time of the admonition)?! This state of affairs encompasses all the creation, except that that which maintains wakefulness differs in maintaining their influences.
[a] There are those amongst the (people) who are firm and they do not go back and forth—they proceed towards (wakefulness and righteous action) without turning away. And had it been that they were hindered by their natural inclinations, they would not have complained just as Handhalah (radiyallaahu-anhu) complained about himself, (saying): ‘’Handhala has turned to be a hypocrite.’’ 
[b] And there are a people amongst the people whose natural inclinations make them incline towards heedlessness at times, and at other times they are called through admonitions to the performance of (righteous) actions. They are similar to a grain of (corn) that is blown back and forth by the breeze.
[c] And there are a people who are not affected by (admonitions) except in accordance with the degree of what they heard, similar to water rolling on a smooth rock.