wise
嶷 centers on the quality of being wise, often with a connotation of lofty or mountain-like sagacity.
嶷 combines 山 (mountain) with 疑, which likely contributes a phonetic element. The character suggests the wisdom of a lofty mountain, but the exact historical development is uncertain.
A mountain (山) with the component 疑 (doubt) suggests a wise person who questions like a towering peak, seeing far and clearly.
For ギョク, imagine a wise old man named Gyoku sitting atop the mountain, dispensing wisdom: Gyoku -> ギョク.