This quote by Thomas Fuller is a warning against acting without comprehending the repercussions. Zeal is enthusiasm and passion, however without knowledge, it can be misdirected and result in disastrous results. It is like a fire without light, which can be destructive and hazardous. Without understanding, enthusiasm can be misguided and lead to unintended repercussions. It is essential to be enthusiastic and passionate about something, however it is equally essential to be informed and knowledgeable about it. Doing something about it without comprehending the repercussions can result in unintended and negative outcomes. Therefore, it is essential to be enthusiastic and enthusiastic, however also to be notified and experienced about the topic. This quote works as a suggestion to be passionate and enthusiastic, but likewise to be informed and well-informed prior to taking action.