It means, the cours of true love is not a plain path... it's a course with many curves, many obstacles and things you can't prevent from. Some things will be disappointments, some things will be good surprises...

The quote is from "A Midsummer Night's Dream" by William Shakespeare. It's meaning is simple: True love always encounters problems or difficulties, a theme that Shakespeare repeats several times in various plays. This play is one of Shakespeare's comedies, about a group of lovers who spend the night being pranked and taunted by fairies. The attitude of the play can be summed up in a famous line from Act 3 scene 2, the character Puck speaking to Oberon, "Lord, what fools these mortals be!"

In this sentence true love is being compared to how a river flows. If true love was a river then it wouldn't run smoothly. Which literally means: Finding true love is never easy To find true love there can be a lot of problems and obstacles we must face

Romance compared to a river current.

yea but thats how you find your true love