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John Gill
Boast not thyself of tomorrow,.... Or, "of tomorrow day" (t). Either of having a tomorrow, or of any future time; no man can assure himself of more than the present time; for, however desirable long life is, none can be certain of it; so says the poet (u): for though there is a common term of man's life, threescore years and ten, yet no one can be sure of arriving to it; and, though there may be...
Matthew Henry
1 Boast not thyself of to morrow; for thou knowest not what a day may bring forth. Here is, 1. A good caution against presuming upon time to come: Boast not thyself, no, not of to-morrow, much less of many days or years to come. This does not forbid preparing for to-morrow, but presuming upon to-morrow. We must not promise ourselves the continuance of our lives and comforts till to-morrow, but...
Charles H. Spurgeon
Boast not thyself of tomorrow; for thou knowest not what a day may bring forth. Let us never boast of future days and years, or what we mean to do when we come to any age, or what shall be our position when we grow gray. Let us never boast of anything in the future, for we cannot tell what even a day may bring forth.