Good Heart

It is said:

قلبك هو البئر، ولسانك هو الدلو،
فلن يغرف الدلو إلا بما يوجد في البئر …
‘𝗬𝗼𝘂𝗿 𝗵𝗲𝗮𝗿𝘁 𝗶𝘀 𝗹𝗶𝗸𝗲 𝗮 𝘄𝗲𝗹𝗹 𝗮𝗻𝗱 𝘆𝗼𝘂𝗿 𝘁𝗼𝗻𝗴𝘂𝗲 𝗶𝘀 𝗹𝗶𝗸𝗲 𝗮 𝗯𝘂𝗰𝗸𝗲𝘁. 𝗧𝗵𝗲 𝗯𝘂𝗰𝗸𝗲𝘁 𝘄𝗼𝗻’𝘁 𝗴𝗲𝘁 𝗮𝗻𝘆𝘁𝗵𝗶𝗻𝗴 𝗲𝘅𝗰𝗲𝗽𝘁 𝘄𝗵𝗮𝘁’𝘀 𝗶𝗻 𝘁𝗵𝗲 𝘄𝗲𝗹𝗹.’

Let’s not fool ourselves:

Anyone who talks bad, but says: ‘my heart is good’, is a liar. The fact what we do evil and speak evil, is an indication that our hearts have become polluted.

It has been narrated in a weak report:
إِنَّ هَذِهِ الْقُلُوبَ تَصْدَأُ كَمَا يَصْدَأُ الْحَدِيدُ إِذَا أَصَابَهُ الْمَاءُ
“𝗧𝗵𝗲𝘀𝗲 𝗵𝗲𝗮𝗿𝘁𝘀 𝗯𝗲­𝗰𝗼𝗺𝗲 𝗿𝘂𝘀𝘁𝘆,
𝗷𝘂𝘀𝘁 𝗮𝘀 𝗶𝗿𝗼𝗻 𝗱𝗼𝗲𝘀 𝘄𝗵𝗲𝗻 𝘄𝗮𝘁𝗲𝗿 𝗴𝗲𝘁𝘀 𝘁𝗼 𝗶𝘁.”
[‘Mishkat al-Masabih’, 2168].
https://sunnah.com/mishkat:2168