The Prophet, sallallahu ‘alayhi wasallam, mentioned about Abu Bakr as-Sidiq where he said that If you put the iman of all the Muslim ummah on one scale and the iman of Abu Bakr as-Sidiq on the other scale, the iman of Abu Bakr as-Sidiq would outweigh the iman of the whole ummah. The Prophet, sallallahu ‘alayhi wasallam, also said that there is something in the heart of Abu Bakr as-Sidiq that distinguished it from others, and as it is known he was called as-Sidiq. The Prophet, sallallahu ‘alayhi wasallam, once said about Abu Bakr: “When I call someone to Islam, he will have some hesitation…except Abu Bakr as-Sidiq. The minute I talked to him about Islam, straight away he believed in me, he believed in Allah and that I am the Messenger of Allah.” So it has to do with the heart that distinguished Abu Bakr as-Sidiq to be al-Khalifatul-Awal, and to be the first Sahabi (Companion). From this, it can be said that every Muslim should care about his/her heart, purify it and activate iman in the heart, and practise the great principles of Tawhid, such as to love Allah, to fear Him, to rely on Him, to have hope in Him, to seek help fro Him and to seek refuge in Him so that the heart is alive, activated and full of iman. And at the same time we have to make sure that there should be no diseases or anything bad within our hearts, e.g. greediness, envy, arrogance, etc. Only then will the heart be sound.