She does treat her sons roughly, as if not hers—

In vain is her toil because she has no dread.

Only humans have a conception of the future, or plan for the future. They can look forward to time indefinite, to infinity. The Bible says of God’s gift to man: “Even time indefinite he has put in their heart.” (Eccl. 3:11) Animals, on the other hand, live only for the immediate moment or the immediate satisfaction of their desires. Man builds for the future. He uses the information and discoveries of history to plan his future, and most men would like to continue to pursue their purposes to time indefinite. Men “dread” the end of their lives. They know how life turns out​—first, the aging process toward death, then the leaving of loved ones, being unable to carry out their projected works, the ceasing of all enjoyment and being soon forgotten. But animals do not have that “dread,” just as the Bible says with regard to the ostrich.