ps 54:4

"surely God is my help; the Lord is the one who sustains me"- NIV
"behold, God is my helper; the Lord is the sustainer of my soul"- NASB

sustain: to lean, lay, rest, support, put, uphold, lean upon, brace, refresh, or revive.

Yahweh sustains me. He sustains my soul. I can lean on Him. I can brace myself against Him. He will revive and refresh me. He is my support and my upholder.