In Psalm 51:12; 54:4, "uphold me" signifies to support; here, the spiritual life of the humble. (Divine Love and Wisdom 49)

In Isaiah 41:10, it signifies the power and wisdom of the Lord to sustain man in temptations. (Apocalypse Explained 298[10])

In Isaiah 42:1, it signifies the Divine Human of the Lord. (Arcana Coelestia 2159[4])

In Ezekiel 30:6, the failure of people who "uphold Egypt" signifies that outward knowledges held in the memory are not sustaining, and people who trust in them will perish through evil loves. (The Inner Meaning of the Prophets and Psalms 153)