He is the First and the Last, the Outward and the Inward. He has knowledge of all things. (Surat al-Hadid, 57:3)
The signs of Allah's existence, which are spread throughout the universe, are evident for all people of understanding. Grasping Allah's existence demands no more than a careful scrutiny into one's surroundings, for the universe abounds with signs of creation. From the simplest to the most complex ones, all systems reveal a network of miracles that present even more mysteries as one makes an in-depth analysis. In the Qur'an, Allah gives the following examples of these miracles:
Have they not looked at the sky above them: how We structured it and made it beautiful, and how there are no fissures in it? And Earth: how We stretched it out and cast firmly embedded mountains onto it and caused luxuriant plants of every kind to grow in it? (Surah Qaf, 50:6-7)
Have they not looked at the birds above them, with wings outspread and folded back? Nothing holds them up but the All-Merciful. He sees all things. (Surat al-Mulk, 67:19)
Allah splits the seed and kernel. He brings forth the living from the dead, and produces the dead out of the living. That is Allah, so how are you deluded? He splits the sky at dawn, and appoints the night as a time of stillness and the Sun and the Moon as a means of reckoning. That is what the Almighty, the All-Knowing has ordained. He has appointed the stars for you so you might be guided by them in the darkness of the land and sea. We have made the Signs clear for people who have knowledge. (Surat al-An‘am, 6:95-97)
No doubt, these are just a few examples. Elsewhere, Allah reminds His servants of His existence through many examples. One of their most telling attributes is that they ponder over everything they see and gradually comprehend Allah's existence and greatness. As we mentioned above, each detail in our universe makes us feel that we were created.
People of intelligence who recognize Allah's greatness and power surely feel an inner awe toward our Creator, Who will call each one of them to account for their deeds in the Hereafter. Therefore, they spend their lives striving to earn His good pleasure. In one verse, Allah says the following:
Those who remember Allah, standing, sitting, and lying on their sides, and reflect on the creation of the heavens and Earth: “Our Lord, You have not created this for nothing. Glory be to You! So safeguard us from the punishment of the Fire.” (Surah Al ‘Imran, 3:191)