Ikhlaas and Tawheed are a tree in the heart

“Get yourself out of this limited world of diseases to the wide world of the hereafter, which has what the eyes have never seen. Nothing is impossible there, and love is not lost. O you who sold yourself for the sake of something that will cause you suffering and pain, and which will also lose its beauty, you sold the most precious item for the cheapest price, as if you neither knew the value of the goods nor the meanness of the price. Wait until you come on the Day of mutual loss and gain and you will discover the injustice of this contract. “There is no God but Allah” is something that Allah is buying. Its price is Paradise, and the Messenger is its agent, and you will be pleased to part with a small part of this worldly life to obtain it. The part you lose is a small part of something that as a whole is not worth a mosquito’s wing.”
Ibn ul Qayyim al Jawziyyah

The divine decree related to the believer is always a bounty, even if it is in the form of withholding (something that is desired), and it is a blessing, even if it appears to be a trial, and an affliction that has befallen him is in reality a cure, even though it appears to be a disease!
Unfortunately, due to the ignorance of the worshipper, and his transgressions, he does not consider anything to be a gift or a blessing or a cure unless he can enjoy it immediately, and it is in accordance with his nature. If he were only given a little bit of understanding, then he would have counted being withheld from as a blessing, and the sickness as a mercy, and he would relish the trouble that befalls him more than he relishes his ease, and he would enjoy poverty more than he enjoys richness, and he would be more thankful when he is blessed with little than when he is blessed with a lot.
Imam ibn al Qayyim rahimahullah :
Madarij al-Salikin 2/215-216


Between their two prayers lies a gulf as [vast] as that separating Heaven from earth
“Someone who turns away in prayer, either with his eyes or his heart, is like a man whom the king summons and seats before him: just when the king starts to call out his name and addresses him, the man turns from him right and left, and his heart turns away. And since his heart is not present, he understands nothing of what the king says to him. What should this man expect from the king in return? At the very least, should he not expect to leave the palace – rejected, cast out and beneath consideration?
This worshipper is in no wise equal to the one whose heart is present, turned in prayer towards God and so aware of the Grandeur of the One before whom he stands that his heart is filled with awe, his head inclines and he would be ashamed before his Lord to face anyone else, or turn away.
About these two prayers, as Hassan bin ‘Atiya said: ‘Two men may offer prayer shoulder to shoulder, and yet between their two prayers lies a gulf as [vast] as that separating Heaven from earth. This is because one of them has his heart turned towards God, while the other is forgetful and heedless.’
Extract: The Invocation of God; Ibn al-Qayyim al-Jawziyya; page 26.

“Ikhlaas and Tawheed are a tree in the heart. Its branches are good actions. Its fruits are a good life in this world, and eternal comfort in the Hereafter, and just like in Paradise the fruits whose supply is not cut off, nor are they out of reach, likewise are the fruits of Tawheed and Ikhlaas in this world.” “An action done without Ikhlaas and without following the Messenger is like a traveller whose sock becomes filled with sand, which weighs him down, and has no benefit.” “Allaah loves from His slave that he beautifies his tongue with the truth, and his heart with Ikhlaas and love, turning repentantly with reliance upon Allaah.”
Ibn al-Qayyim – ‘al-Fawaid’