Passage
Boast not for to morrow, for thou knowest not what the day to come may bring forth.
Boast not for to morrow, for thou knowest not what the day to come may bring forth.
Proverbs 27:1 Boast not for to morrow, for thou knowest not what the day to come may bring forth.
Proverbs 27:2 Let another praise thee, and not thy own mouth: a stranger, and not thy own lips.
Proverbs 27:3 A stone is heavy, and sand weighty: but the anger of a fool is heavier than them both.
The verse centers on "boast", "morrow", "thou", "knowest", "come", "bring", and "forth". It is saying that the verse draws attention to "boast" and "morrow", so its meaning should be read from those terms before moving to application.
The next verse adds "Let another praise thee and not thy...", so "boast" and "morrow" should be read forward into that movement. In Proverbs context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "boast" and "morrow" with trust shaped by these words, not by a vague optimism outside the passage.