சொல்லின்வகைகளை அறிந்துமனத்தால் சுத்தமானவர்கள், கற்றவர் அவை, கல்லாதவர் அவை என அறிந்து பேசும்போது, பயத்தால் சொல் குற்றப்படமாட்டார்கள்.

சொற்களை அளவறிந்து உரைத்திடும் தூயவர்கள் அவையிலிருப்போரின் வகையறியும் ஆற்றல் உடையவராயிருப்பின் பிழை நேருமாறு பேச மாட்டார்கள்

சொற்களின் தூய்மை தொகுதி அறிந்த தூய்மை உடையவர், அவைக்களத்தின் வகையினை அறிந்து, வல்லவறின் அவையில் வாய்ச் சோர்ந்து பிழை சொல்லமாட்டார்.

The pure who know the classification of words having first ascertained the nature (of the court) will not (through fear) falter in their speech before the powerful body

Kural 721 emphasizes the power of knowledge and the purity of speech. This verse highlights the virtues of those who are well-versed in their language, understand the nature of their audience, and are not intimidated by the presence of powerful individuals. These individuals are referred to as 'pure', signifying their integrity, wisdom and clarity in their thought processes. They have a deep understanding of words and their classifications. In the context of the Tamil language, this points to knowing the right usage of vocabulary and grammar, and their nuances. The verse also highlights the importance of understanding the audience or the context (the nature of the court) before speaking. This suggests the need for being aware of socio-cultural norms, the nature of the people one is addressing, and the situation at hand. Lastly, it emphasizes the courage of these learned individuals who do not falter in their speech, even in front of a powerful assembly. This implies that their deep knowledge and understanding give them the confidence to speak without fear or hesitation, maintaining their integrity and honesty. Overall, this verse is a tribute to the power of knowledge, eloquence, understanding, and courage, which together make a person's speech effective, respectful, and fearless.