Step-by-step explanation:
In this quote, the author defines each of the terms mentioned, which are "ability", "motivation", and "attitude".
"Ability" is the possession of the means or skill to do something. It can be anything that you possess or own in yourself, such as "the ability to see", "the ability to work", etc.
"Motivation" is the desire to act in service of a goal. The more motivation you have, the happier you get, therefore leading to doing a good job and working hard.
"Attitude" is a settled way of thinking or feeling about something. It is similar to "behavior" and determines how well a person achieves a certain thing.
Therefore, to sum it up, this quote is generally talking about the definitions of ability, motivation, and attitude. If you have these three traits, then you would indeed be successful in the future.
Hope this helped!
~Jinachi~