Providence. Walking with Jesus doesn't exempt us from hardship, pain and suffering. This Psalm is a reminder that if we are looking to the hills for help (which was where the god's of the day would have lived), then we are looking in the wrong place. Our help comes from the creator, not the creation. 

Security. The emphasis of Psalm 125 is on the solidity of the Christian life; “Living as a Christian is not walking on a tightrope without a safety net, high above a breathless crowd, many of whom would like nothing better than the morbid thrill of seeing you fall; it is sitting secure in a fortress”

Our security is found not by living by our feelings about God, but by facts about God. Our security comes from who God is, not from how we feel. As Eugene Peterson puts it - “Discipleship is a decision to live by what I know about God, not by what I feel about him, or myself or my neighbours”