To trust is to put oneself entirely in the confidence of someone to safeguard his life with his. This is a mighty assurance that only God can assume certainty. People shift like sand, most times inadvertently. Others are like the sea which is restless and unyielding. Worse, some are like the wind, inconsistent and tentative.
Only God is steadfast. Therefore, our security should be in HIM alone. Like Mount Zion that endures forever, our trust should be in God who is the same yesterday, today and always.
In Psalm 125, verse 1 it says:
Those who trust in the Lord are like Mount Zion,which cannot be shaken but endures forever.