Shared ground
These two sayings connect wisdom with restraint. The explicit claims are straightforward: fewer words are presented as evidence of “knowledge,” an even spirit is presented as a mark of “understanding,” and silence can cause others to treat even a fool as wise (Prov 17:27–28). In other words, wise character is not only (or mainly) recognized by what someone can say, but by what they choose not to say and how steady they remain.
The passage also assumes a social setting where people evaluate character based on speech and visible reactions. Because talk is a primary way others “read” a person, restraint shapes reputation.
Where interpretation differs
One real question is whether v. 28 is mainly describing social perception (“people will think you’re wise”) or making a stronger point about wisdom itself (“silence is wisdom”). Many readers see the verse emphasizing perception: silence can hide folly and so earns a public “benefit of the doubt.” Others read it as closer to a moral claim: refusing to speak when one might expose foolishness is itself a kind of practical wisdom.
A second question is what “knowledge” in v. 27 emphasizes: learned information or practical judgment. The verse can be read either way, but it clearly ties “knowledge” to controlled speech rather than to showing off what one knows.
Why the disagreement exists
The wording “is counted wise” and “is thought discerning” naturally points toward reputation and evaluation by others, yet Proverbs often speaks in compressed, proverb-like form where outward behavior and inner wisdom tend to be linked. Also, terms like “knowledge” can cover both content and good judgment depending on context.
What this passage clearly contributes
The passage contributes a concrete picture of wisdom as self-control: restraint in words and steadiness in spirit are treated as recognizable signs of insight. It also highlights a caution about reputation: silence can sometimes produce an appearance of wisdom even where true wisdom is lacking. Together, these sayings portray speech and emotional control as key places where wisdom is displayed and assessed in community life.