Do you know who cries the most in the Bible?  King David!  He's no cry baby -- he's a man of tears! 

He knows that those who sow in tears will reap in songs of joy.  So, we dip, we indulge in salt water at the beginning of the seder with hope that, by the end of the seder, God will wipe away the tears from every face.  (Isaiah 25:8 and Revelation 7:17, 21:4)ben+shahn+sad.jpg

haggadah Section: Karpas
Source: Rav Shai Cherry and Ben Shahn