There are people who Hashem blessed with developed intellect and deep thinking with which they could attain great achievements in Torah, acquire deep love and fear of Hashem, and do great deeds. The evil inclination sees their tremendous potential, and keeps them busy with distractions and self-inflicted commitments until they have no time to catch a minyan, not to speak of setting aside time for learning. Not only do they not think about what Hashem put them here for, but use their heaven given qualities to delve deeper into the vanities of this world.
And then there are those who set aside time to learn only on Shabbos, and although this is definitely praiseworthy, a person is required to learn every day, especially those who were blessed with a developed intellect. Every person has his own special part in the Torah, and no doubt a person blessed with abundant talent has a greater portion in the Torah than someone with less. If a very talented person uses his intellect just on mundane matters all week, he surely will not acquire more than a small part of what he could have, and will be totally mortified when asked to display his knowledge in the heavenly court. After asking every morning in the prayers, ‘give me my portion of Torah’, he then ignores it when offered to him.