"Do not be deceived, God is not mocked; for whatever a man sows, this he will also reap. For the one who sows to his own flesh shall from the flesh reap corruption, but the one who sows to the Spirit shall from the Spirit reap eternal life."

Galatians 6:7-8 (NASB)
The foolish by definition do not understand the consequences of their actions. They do not see the connection between what they choose and what will happen as a result of their decision.
The wise understand the implications of their choice upon their life. They see very clearly the end result of their decisions for both for the present and future.
Sowing has the effect of multiplying the affects of what is done. Evil is multiplied, but so is good.