The word "tongue" represents what he says. Possible meanings are 1) Yahweh has enabled him to speak as one who has learned to speak skillfully. Alternate translation: "The Lord Yahweh has enabled me to be a skillful speaker" or 2) Yahweh has taught him what to say. Alternate translation: "The Lord Yahweh has enabled me to speak what he has taught me" (See: [[rc://en/ta/man/jit/figs-metonymy]])
Here "my ear" refers to Yahweh's servant. Yahweh enabling him to hear and understand what Yahweh teaches him is spoken of as if Yahweh awakened his ear from sleep. Alternate translation: "he has enabled me to understand what he says" (See: [[rc://en/ta/man/jit/figs-synecdoche]] and [[rc://en/ta/man/jit/figs-metaphor]])
The servant compares himself with a student who learns from his teacher. Possible meanings are 1) "like one who learns from his teacher" or 2) "like one whom he has taught" (See: [[rc://en/ta/man/jit/figs-simile]] and [[rc://en/ta/man/jit/figs-activepassive]])