Isaac sowed grain in that region that year.
He reaped a hundredfold, for G-d had blessed him
Genesis 26:12
It is clear from a close reading of the Torah’s narrative that the patriarchs
were astute businessmen. Nonetheless, it is also clear that they engaged
in material pursuits solely with the objective of fulfilling G-d’s will.
In this case, Isaac’s true goal in sowing grain was to be able to give
charity to the poor, which the Torah stipulates can only be performed
with one’s own produce. Like our patriarchs, when our involvement in
the pursuit of a livelihood and wealth is similarly motivated, we are
blessed with overwhelming success.
—from Daily Wisdom #1