saw this over shabbat from a parsha sheet.
the Nefesh Shimshon writes: The key to success is constant [thrust].
When they first wanted to build a spaceship to fly to outer space,
they calculated how much fuel was needed. But due to the great
distances, the amount of fuel needed seemed enormous, way beyond the
capacity of any spaceship to possibly carry. However, afterwards they
realized that the difficulty is only in the first stage - when the
spaceship is still close to the earth's atmosphere, where the force of
gravity still binds it to the earth. But when it breaks out
sufficiently far from the pull of gravity, it will be able to continue
towards the moon. Until the heavens! This patent exists also in
Judaism. A person desires to reach the Ribono shel Olam (G-d), and
people jump and jump, 80 years they jump, but they remain on the
ground. They do not succeed in soaring. Why? Because "to learn one
hour and stop, one hour and stop upholds nothing" (Chazon Ish). Hence
they jump and jump but remain in the same place. The advice is to make
a powerful leap, to apply oneself to his learning with all of his
might. Until when? Until he feels that he is freeing himself from the
pull of gravity. The pull which draws one towards the childish, the
foolishness and vanities. True, the first effort is extremely
difficult. But the foundation is to break out of the force of gravity,
the pull towards life attached to the earth, because all the time one
remains on the ground, it is impossible to soar. One learns and
learns, but in effect he paces around the same place.
maybe this answers it, in that perhaps today people dont have enough mental strength to apply themselves far beyond the "comfort zone" for much time.