Proverbs 4:18 (NKJV) "But the path of the just is like the shining sun, That shines ever brighter unto the perfect day."
This is the key verse of Proverbs 4. It pictures the sunrise( the shinning sun) and the increasing of the light on the pilgrim path as the day advances. If we walk in the way of God's wisdom, the path gets brighter and brighter and no sunset comes. If it is getting darker for you , then you are not walking in the path God has for you. When the path ends, we step into a land where the light never dims, for " there shall be no night there"(Rev.22:5).