Ibn al-Qayyim (rahimahullaah) said:
And mankind, with regard to th eir performance of prayer are in five levels:
The First: The level of the one who is negligent and wrongs his soul: He is the one who falls short in performing wudhoo properly,
performing the prayer upon its time and within its specified limits, and in
fulfilling its essential pillars.
The Second: The one who guards his prayers upon their proper times and within their specified limits, fulfils their essential pillars
and performs his wudhoo with care. However, his striving (in achieving the
above) is wasted due whisperings in his prayer so he is taken away by thoughts
and ideas.
The Third: The one who guards his prayers within the
specified limits, fulfils their essential pillars and strives with himself to
repel the whisperings, thoughts and ideas. He is busy struggling against his
enemy (Shaytaan) so that he does not steal from the prayer. On account of this
he is engaged in (both) prayer and jihaad.
The Fourth: The one who stands for the prayer , completes and perfects its due rights, its essential pillars, performs it within its specified limits and his heart becomes engrossed in safeguarding its rights and
specified limits, so that nothing is wasted from it. His whole concern is
directed towards its establishment, its completion and its perfection, as it
should be. His heart is immersed in the prayer and in enslavement to his Lord
the Exalted.
The Fifth: The one who stands for the prayer like the one
mentioned above. However, on top of this, he has taken and placed his heart in
front of his Lord Azzawajall, looking towards Him with his heart with
anticipation, (his heart) filled with His love and His might, as if he sees and
witnesses Allaah. The whisperings, thoughts and ideas have vanished and
the coverings which are between him and his Lord are raised. What is between
this person and others with respect to the prayer, is superior and greater than
what is between the heavens and the earth. This person is busy with his Lord
Azzawajall, delighted with Him.
The First type will be punished, the second type will be held to account, the third will have his sins and shortcomings expiated, the fourth will be rewarded and the fifth will be close to his Lord, because he will receive the portion of the one who makes his prayer the delight
and pleasure of his eye. Whoever makes his prayer,the delight and pleasure of
his eye, will have the nearness to his Lord Azzawajall made the delight and
pleasure of his eye in the hereafter. He will also be made a pleasure to the eye
in this world since whoever makes Allaah the pleasure of his eye in this
world, every other eye will become delighted and pleased with
him.