According to Aristotle, a life of happiness is constituted by the virtues, as he defines moral virtue as a temperament to behave in the right manner and as a means between extremes of deficiency or lack and excess, which are vices.
So, the statement is true.
According to Waddell in his book Happinnes and the Christian Moral Life:An introduction to Christian Ethics(2008) states that we all crave happiness and the study of ethics is to achieve happiness. He further delves into how ethics define happiness and virtues are enshrined in the study and adherance to ethics. He states that Aristotle and Thomas Aquinas claim that the essence of life is the pursuit of happiness from the careers,friends,tasks,etc. That the pursuit of happiness can be misleading and that ethics which enshrines values and virtues in people help guide them in their decision making and in their choices of careers and decisions. It further assists them in knowing what decisions are ethical and vituous.. So the statement is true