When a person has the true concern and strives to fulfil all that is outstanding, Allah Ta‘ala will assist him and will not forsake him. Allah Ta‘ala will take care of him, and not only him, but generations to follow.
The assistance of Allah Ta‘ala will definitely be there for this person even though it may come after some time in certain instances. Look at the incident of Hazrat Moosa (‘alaihis salaam). The assistance of Allah Ta‘ala came at the last moment when the Bani Israaeel felt that the army of Fir‘oun were about to intercept them. The sea parted and they were saved while Fir‘oun and his entire army were destroyed.