Fishing lines or nets are cast with the intent of bringing in something heavy or substantial. Our burdens are cast with the  intent of getting rid of something heavy or substantial. David was grieving over his situation, he not only felt dethroned but that God’s favor had left him. After all, his trusted advisor, Ahithophel, joined the conspirators. David remembered that if God could sustain this spinning cosmos, He would sustain this part of life that was spinning out of control! – Teresa #throwitupOnHim #Heisable

2 Samuel 15: 30, 31 ( ESV)

30 But David went up the ascent of the Mount of Olives, weeping as he went, barefoot and with his head covered. And all the people who were with him covered their heads, and they went up, weeping as they went. 31 And it was told David, “Ahithophel is among the conspirators with Absalom.” And David said, “O Lord, please turn the counsel of Ahithophel into foolishness.”

Psalm 55: 13-22 (NIV) bold added for emphasis

13 “But it is you, a man like myself,  my companion, my close friend,14 with whom I once enjoyed sweet fellowship  at the house of God, as we walked about among the worshipers.15 Let death take my enemies by surprise;  let them go down alive to the realm of the dead,  for evil finds lodging among them.16 As for me, I call to God,and the Lord saves me.17 Evening, morning and noon  I cry out in distress, and he hears my voice.18 He rescues me unharmed  from the battle waged against me,  even though many oppose me.19 God, who is enthroned from of old,who does not change- he will hear them and humble them,  because they have no fear of God.20 My companion attacks his friends; he violates his covenant.21 His talk is smooth as butter,  yet war is in his heart; his words are more soothing than oil,  yet they are drawn swords.22 Cast your cares on the Lordand he will sustain you;he will never let  the righteous be shaken.”