Yong and Jia

Yóng - presence, devotion

Hexagram 20, judgment 觀盥而不薦。有孚顒若。
Wilhelm: CONTEMPLATION.
The ablution has been made,
But not yet the offering.
Full of trust they look up to him.

Ritsema and Karcher:
Viewing: hand-washing and-also not worshipping.
Possessing conformity, presence like.

The character they render as "look up" or "presence" is yóng.

yong - presence

Yóng is composed of two parts, at left 1: picture of (spider-)monkey. Meaning: use continually, benevolent. Part 2: figure with big head (could it be an animals mask of a Wu?)
At right the modern way of writing yong.

According to Ricci (13039): Big head. Grave, serious, impassive, solemn. Passionately hope for. Yóngyóng affable, benevolent, respectful. According to Wenlin: big, great; admire, look up to. Yóngyóng look up to; admire.

'benevolent'

'availing of'

But the old character of the left part yong “use continually, benevolent” (Ricci 13020) looks like the character yong, “availing of” (Ricci 13019, picture of a tripod) with an extra addition at the top. Seems to me more likely than a monkey. The meanings all have to do with continuality, totality or something close to it. Yongyong: use continually. Yongge: a tripod which is continually in use. Jinyong: bronze heads which cover both extremities of an axle. Yonghui: show benevolence. Yongdong: use until the end of the defined period. Yongyong: give all one's efforts. Yongzhi: attained maturity of spirit.

Jiă - serve

In 37 line 5, and in the image of 45, 55 and 59 jiă is usually translated as 'to near'. See Harmen's article (Dutch) for another option. The king does not near the temple, but serve it!

Ritsema/Karcher has "imagine". Wenlin: originally "two" + "skin": second (false) skin. "Person" was added later.

Meanings of jiă: false; fake; phony; artificial.〈Law〉conditional; tentative. Borrow; avail of. If; supposing.
Jiă dào is via, by way, jiămíng is pseudonym (like a second skin).
Harmen translates more like “lend itself, in the place of, put into service”.

Jià (different pronunciation): holiday, leave of absence, furlough.

Above: from Wang Hongyuan "The origins of Chinese characters", Sinolingua Beijing, 1993.
Jia: false, to borrow. Two hands obtaining ore from a quarry. According to most other sources, the left part means double skin.

Below: from Wieger "Chinese characters", 1924.
Jia is lesson 121. Chia3: false, borrowed, to have two skins, a double skin.