Hermine Dow,
From the next paragraph after the one that you referenced, it looks to me like Yada meant the Hebrew word is tob (H2896) although emeth (H571) is usually translated as true.
H2896
טוב
ṭôb
BDB Definition:
1) good, pleasant, agreeable (adjective)
1a) pleasant, agreeable (to the senses)
1b) pleasant (to the higher nature)
1c) good, excellent (of its kind)
1d) good, rich, valuable in estimation
1e) good, appropriate, becoming
1f) better (comparative)
1g) glad, happy, prosperous (of man’s sensuous nature)
1h) good understanding (of man’s intellectual nature)
1i) good, kind, benign
1j) good, right (ethical)
2) a good thing, benefit, welfare (noun masculine)
2a) welfare, prosperity, happiness
2b) good things (collective)
2c) good, benefit
2d) moral good
3) welfare, benefit, good things (noun feminine)
3a) welfare, prosperity, happiness
3b) good things (collective)
3c) bounty
Part of Speech: see above in Definition
A Related Word by BDB/Strong’s Number: from H2895
H2895
טוב
ṭôb
BDB Definition:
1) to be good, be pleasing, be joyful, be beneficial, be pleasant, be favourable, be happy, be right
1a) (Qal)
1a1) to be pleasant, be delightful
1a2) to be glad, be joyful
1a3) to be better
1a4) to be well with, be good for
1a5) to be pleasing
1b) (Hiphil) to do well, do good, act right, act rightly
Part of Speech: verb
A Related Word by BDB/Strong’s Number: a primitive root
H571
אמת
'emeth
BDB Definition:
1) firmness, faithfulness, truth (noun feminine)
1a) sureness, reliability
1b) stability, continuance
1c) faithfulness, reliableness
1d) truth
1d1) as spoken
1d2) of testimony and judgment
1d3) of divine instruction
1d4) truth as a body of ethical or religious knowledge
1d5) true doctrine
2) in truth, truly (adverb)
Part of Speech: see above in Definition
A Related Word by BDB/Strong’s Number: contracted from H539
G228
ἀληθινός
alēthinos
Thayer Definition:
1) that which has not only the name and resemblance, but the real nature corresponding to the name, in every respect corresponding to the idea signified by the name, real, true genuine
1a) opposite to what is fictitious, counterfeit, imaginary, simulated or pretended
1b) it contrasts realities with their semblances
1c) opposite to what is imperfect defective, frail, uncertain
2) true, veracious, sincere
Part of Speech: adjective
A Related Word by Thayer’s/Strong’s Number: from G227
G227
ἀληθής
alēthēs
Thayer Definition:
1) true
2) loving the truth, speaking the truth, truthful
Part of Speech: adjective
A Related Word by Thayer’s/Strong’s Number: from G1 (as a negative particle) and G2990
Shabbat shalom