"It ain't bragging if you can do it"

The quote "it ain't boasting if you can do it" by Dizzy Dean means that it is not considered conceit or boasting if a person is able to back up their words and accomplishment. It is only appropriate to boast if the person is able to achieve the important things they promised. One need to be confident in their abilities and must not avoid expressing it. However, it is necessary to show one's capabilities rather of simply blabbering about them. In essence, this quote functions as a reminder that a person ought to always aim to show their worth in action instead of simply by words.