6 He only [is] my rock and my salvation: [he is] my defence; I shall not be moved. 7 In God [is] my salvation and my glory: the rock of my strength, [and] my refuge, [is] in God. 8 Trust in him at all times; [ye] people, pour out your heart before him: God [is] a refuge for us. Selah.
Verse 6 Defense = security, stronghold... has the picture of a parent lifting a child above the ocean waves.
Verse 7 Refuge = shelter, safety, protection. Picture of a child running to hide behind the parent. The child is frightened till it has safely found refuge behind the parent.
Verse 8 Trust = confidence, feel safe, to be careless. The picture here is you don’t have to be on guard when you are trusting in the Lord. You can allow yourself to let down your guard knowing you are protected.