Gains and Profits
Essence of Worship
Al-Dhariyat (The Scattering Winds) Sura 51: Verses 56-58
"I have only created the invisible beings [jinn] and the human beings so that they may [know and] worship Me. No sustenance do I ever want from them, nor do I want them to feed Me. Surely, God is the Provider of all sustenance, the One with all might, the Ever-invulnerable"
God has His purpose and plan behind creation, which we may understand as giving all creatures the chance to fulfill their potentials through following the natural laws of the Creator. For human beings, this means following God's guidance and the human mind.
Devotion and Knowledge
Al-Zumar (The Crowds) Sura 39: Verse 9
"Is one who does devotions throughout the night, prostrating himself and standing, cautious about the next world and hoping for the mercy of his Lord? Say: 'Are they equal, those who know and those who know not?'"
"Devotion" is undertaking the courteous acts of service outwardly and inwardly without slackening or shortcoming, being cautious because of the threatened chastisement and hoping for the promised reward.