True sincerity can lead habits to be acts of worship if they are done with the right intentions. Many of the companions would actually hide a lot of their acts of good and worship so that they would ensure its sincerity. Thus, sincerity is the defining factor of our actions that determine whether our actions will be accepted or not. No matter how outwardly correct we may seem, without inward purity and sincerity, our spiritual practice and our moral life are meaningless.