Who or what do we lean upon?

Hebrews 13:5-8 NIV
[5] Keep your lives free from the love of money and be content with what you have, because God has said, “Never will I leave you; never will I forsake you.” [6] So we say with confidence, “The Lord is my helper; I will not be afraid. What can mere mortals do to me?” [7] Remember your leaders, who spoke the word of God to you. Consider the outcome of their way of life and imitate their faith. [8] Jesus Christ is the same yesterday and today and forever.