This quote by Euripides speaks to the importance of having both boldness and cleverness in order to be successful. Boldness alone is inadequate to achieve success, as it requires the capability to think tactically and use one's wits to make the right choices. Without cleverness, boldness is rendered useless, as it is inadequate to just take action without considering the effects. Boldness without cleverness can result in rash decisions that can have unfavorable repercussions. On the other hand, cleverness without boldness can result in inaction, as one may be too afraid to take risks. For that reason, it is essential to have both boldness and cleverness in order to achieve success.