"I know this already."

But G‑d does not age! For Him, there is no "already." His wisdom is new each day.

"I live within time. Every day I am older."

Each day you are new! Each morning you are born into life again. Don’t you eat again each day as though you have never eaten before? Don’t you thirst as though you have never before drunk water?

"For food I hunger. For water I thirst. For wisdom I feel no thirst."

Look at those who are healthy. See how they swallow down Torah as though they have never eaten before. Just start and do the same as them—and soon you too will be healthy, and feel your thirst for wisdom.
Likutei Sichot vol. 19, pg. 295; Torat Menachem 5742 vol. 2, pg. 820. Maamar Tzion Bamishpat 5736.