I will walk securely

To walk securely is to live one's life securely. Alternate translation: "I will live securely in God" (See: rc://en/ta/man/jit/figs-metaphor and rc://en/ta/man/jit/figs-explicit)

I seek your instructions

To "seek" is to perceive, or gain understanding of God's instructions as if one can see them. (See: rc://en/ta/man/jit/figs-idiom)