Psalms 119:55

I have remembered thy name, O LORD, in the night, and have kept thy law.

The remembrance in the night belongs to the psalm that exalts God's law above all else. Its setting there establishes that law as the governing rule for human life. That same setting establishes the study of God's Word as essential, because in it the principles of righteousness are made plain. There the distinction between right and wrong is clearly defined, and the distinction between truth and error is clearly defined.