Daniel 12:10

Many will be purged, purified (made white) and refined, but the wicked will behave wickedly.  None of the wicked will understand, but those who are (spiritually) wise will understand.

Sin blinds the spirit and limits the understanding, but those who wait on the Lord will have eyes that see the sign of the times.  Our fellowship with the Lord helps refine us and bring us closer to God.  Time with God is well spent for our spiritual lives now and in the future.