The Maitreyi Yajnavalkya dialogue includes a discussion of…

The Maitreyi-Yajnavalkya dialogue includes a discussion of love and the essence of whom one loves, suggesting that love is a connection of the soul and the universal self (related to an individual):

Lo, verily, not for love of a husband is a husband dear, but for the love of the soul a husband is dear.
Not for the love of the wife is a wife dear, but for love of the soul a wife is dear.
— Brihadaranyaka Upanishad 2.4.2–4

Variant translation:

Truly, it is not due to the love of a husband
that a husband becomes dear,
but due to the love of God
that a husband becomes dear.

Truly, it is not due to the love of a wife
that a wife becomes dear,
but due to the love of God
that a wife becomes dear.

Truly, it is not due to the love of all things
that all things become dear,
but due to the love of God
that all things become dear.

satyam bruyat priyam bruyat na bruyat satyam apriyam…

satyam bruyat priyam bruyat
na bruyat satyam apriyam
priyam ca nanrutam bruyat
esha dharmah sanatanah

-Manusmriti

Speak the truth, speak pleasantly,
Do not speak the truth in an unpleasant manner
Even if pleasant, do not speak untruth,
This is the path of eternal righteousness.

Svarüpa of the Ätmä Lord Yama then describes…

Svarüpa of the Ätmä

Lord Yama then describes the svarüpa of the Ätmä,

Tr. – That is not comprehensible by sound, touch, is form-less, un-decaying, tasteless, not subject to time, odourless, beginning less and without end. It is distinct from Mahat and is ever constant. Knowing this one becomes free from the jaws of death. (I.3.15)

-Katha Upanishad, Chapter 1, Verse 3.15