Boast not — Of any good thing which thou purposeth to do, or hopest to receive tomorrow, or hereafter. Knowest not — What may happen in the space of one day. The day is said to bring forth, what God by his almighty power either causes or suffers to be brought forth or done in it.
Related Commentaries of Proverbs 27:1
Proverbs 27:1
1 Boast not thyself of to morrow; for thou knowest not what a day may bring forth.