Seeing his days - are “determined” Since man is so frail, and so short-lived, let him alone, that he may pass his little time with some degree of comfort and then die; see the notes at Job 7:19-21. The word “determined” here means “fixed, settled.” God has fixed the number of his days, so that they cannot be exceeded; compare the notes at Isaiah 10:23, and notes at Psalms 90:10.
The number of his months are with thee - Thou hast the ordering of them, or they are determined by thee.
Thou hast appointed his bounds - Thou hast fixed a limit, or hast determined the time which he is to live, and he cannot go beyond it. There is no elixir of life that can prolong our days beyond that period. Soon we shall come to that outer limit of life, and then we must die. When that is we know not, and it is not desirable to know. It is better that it should be concealed. If we knew that it was near, it would fill us with gloom, and deter us from the efforts and the plans of life altogether. If it were remote, we should be careless and secure, and should think there was time enough yet to prepare to die. As it is, we know that the period is not very far distant; we know not but that it may be very near at hand, and we would be always ready.