From The Quiet Place: Daily Devotional Readings by Nancy Leigh DeMoss:

Throughout the Scripture, whenever one of His children was fearful to step out alone without human support, God’s simple response was, I will be with you. The implication was, I am enough. If you have Me, you have everything you need. The man or woman who trusts His promises can never truly be alone. “My flesh and my heart may fail,” they admit, “but God is the strength of my heart and my portion forever” (Ps. 73:26).