Being safe and secure is spoken of as being like a strong tree. Alternate translation: "I am strong in God's house, like a green olive tree" or "Because I worship in God's house, I am secure like a green olive tree" (See: [[rc://en/ta/man/translate/figs-simile]])
The abstract noun "faithfulness" can be translated with an adjective. Alternate translation: "I will trust in God forever and ever because he is faithful to his covenant" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])