"Those that vow the most are the least sincere"

This quote by Richard Brinsley Sheridan is a warning versus taking individuals at their word. It recommends that those who make the most lavish guarantees are often the least most likely to keep them. This is due to the fact that they are most likely to be motivated by a desire to impress or to make themselves look great, instead of a real dedication to fulfilling their pledges. The quote indicates that it is better to be wary of those who make grand guarantees, as they are most likely to be insincere. It is better to look for people who are more determined in their words and actions, as they are most likely to be genuine and trusted.