"It is a common temptation of Satan to make us give up the reading of the Word and prayer when our enjoyment is gone; as if it were of no use to read the Scriptures when we do not enjoy them, and as if it were no use to pray when we have no spirit of prayer." George Muller
Sometimes I'm eager to spend time in God's Word, wanting to steal away from my daily work to savor it's wisdom and truth. It makes me feel refreshed and renewed.
Other times, I'm not that excited and "feel" nothing significant.
But God's Word is reliable and my feelings are not.
God compares His Word to rain that waters the earth and causes growth, and He assures us that His Words will do everything He sends them to do (Isaiah 55:10-11).
So whether we "feel" it or not, God's Word is always worth our time.