“The common definition of taqwaa is to abstain from the disobedience of Allah subhanahu wata‘alaa. When a person tries to do this it is a struggle, known as mujahadah. Through the barakah of this struggle, actual taqwaa is achieved, wherein the noor (light) of taqwaa is entered into the heart. Once this is achieved, the person will no longer have to struggle much to avoid sins as before; the filth of sin will repel the person.
It is like the prospect of walking through a narrow gully with damp and filthy walls. You will be repelled from the very thought, but even if you do and some filth touches your clothing, you will not be able to rest in peace until it is washed off. When you have acquired the actual taqwaa you are repelled by the filth of sins, and if you do ever slip and make a mistake, you will not find contentment until you repent; this will result in you repenting immediately.”