Pondering over the Great Creation of Allah, The passing away of Life of the World, the Horrors of the Day of Requital and Laxity of One's Nafs
Allah, the Exalted, says:
"I exhort you to one (thing) only: that you stand up for Allah's sake in pairs and singly, - and reflect (within yourselves the life history of the Prophet (PBUH))". (34:46)
"Verily! in the creation of the heavens and the earth, and in the alternation of night and day, there are indeed signs for men of understanding. Those who remember Allah (always, and in prayers) standing, sitting, and lying down on their sides, and think deeply about the creation of the heavens and the earth, (saying): 'Our Rubb! You have not created (all) this without purpose, glory to You! (Exalted be You above all that they associate with You as partners)". (3:190,191)
"Do they not look at the camels, how they are created? And at the heaven, how it is raised? And at the mountains, how they are rooted (and fixed firm)? And at the earth, how it is spread out? So remind them (O Muhammad (PBUH)), you are only a one who reminds".
"Have they not travelled through the earth, and seen..".
Shaddad bin Aus (May Allah be pleased with him) reported: The Prophet (PBUH) said, "A wise man is the one who calls himself to account (and refrains from doing evil deeds) and does noble deeds to benefit him after death; and the foolish person is the one who subdues himself to his temptations and desires and seeks from Allah the fulfillment of his vain desires".
This Hadith highlights the importance of the accountability of one's self. Mere desires which are not coupled with practical efforts are of no avail because Allah grants reward on good deeds and not on yearnings and desires which are not supported by noble actions.