Read psalms 42:1  It is rare to actually catch sight of a deer.  They hide in the thickets where they bed down in the daytime and they only come out in the early evening, at night, and in the early morning.  They always look around first to be sure that no danger is near before they step out of the shadows.  They will only drop their heads to eat grass if they feel secure.  But even in dangerous situations, after a while, the deer gets thirsty and will have to come out of the forest to get a drink.  Here in this verse the deer is called a hart.  David says just like the deer is thirsty for a cool drink of water from a forest brook, so is he longing to be near to God.  David couldn't wait to read about God in the Scriptures and to pray and talk to God, his heavenly Father.  I love God and want to be near to Him.  Do you love God?  Do you want to please Him and make Him happy?  I hope you do.