Human greed and the lust of appetite misuse God's provisions by converting sustaining grains and fruits into destructive poisons.

Original passage

With a liberal hand, God has bestowed His blessings upon men. If His gifts were wisely used, how little the world would know of poverty or distress! It is the wickedness of men that turns His blessings into a curse. It is through the greed of gain and the lust of appetite that the grains and fruits given for our sustenance are converted into poisons that bring misery and ruin.