Abstaining from insulting and hurting others leads to a sound heart and is the guide to success in this life and the hereafter, worshippers will be told on Friday.
"A person with a purified heart will definitely have good intentions, deeds, tongue and other senses alike," says the sermon.
Islam has placed great emphasis on purifying the hearts. As a hadith by Prophet Mohammed concerning the day of judgment, says: "Verily Allah does not look to your faces and your wealth but He looks to your heart and to your deeds."
Those with sound hearts, are also the best people in this world. When the Prophet was once asked "which of the people is best?" he replied: "Everyone who is pure of heart and sincere in speech."
When they asked him what is meant by a "pure heart", he said: "It is [the heart] that is pious and pure, with no sin, injustice, rancour or envy in it."
And as one of the Prophet's companions once said: "There are two deeds of mine that I have the most reliance on. The first is that I never speak what is not necessary, and the second is that my heart is always clear towards all Muslims."
Other actions one can take to acquire a sound heart include reciting and understanding the Quran thoroughly, as it contains enlightening healing lessons.
Hearts are also tranquillised and secured by the remembrance of Allah.
"Additionally, a sincere and submissive heart supplicating to Allah is one of the reasons for accepting prayers," continues the sermon.
Another hadith by Prophet Mohammed says: "Call upon Allah while being certain of being answered, and know that Allah does not respond to a supplication from the heart of one heedless and occupied by play."
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