"Infelicity is an ill to which all acts are heir which have the general character of ritual or ceremonial, all conventional acts"

This quote by J. L. Austin is describing the suggestion that all acts that are considered to be routine or ritualistic in nature are prone to infelicity, or a lack of success or appropriateness. Austin is recommending that these types of acts, which are often done out of tradition or practice, can usually be done without much thought or consideration, and also thus can lead to a lack of success or suitability. This can be seen in several facets of life, such as in spiritual events, wedding events, or other formal events. Austin is recommending that these kinds of acts need to be performed with more idea as well as consideration, as they can frequently cause infelicity if done without proper thought or factor to consider. By doing so, these acts can be made with even more success as well as relevance.