Original Goodness

I have spoken of a light in the soul, a light that is
uncreated and uncreateable ... to the extent that
we can deny ourselves and turn away from created
things, we shall find our unity and blessing in that
little spark in the soul, which neither space nor time
touches.
---Meister Eckhart

In his book "Original Goodness", Eknath Easwaran comments and expands on these words, explaining that Eckhart essentially taught four principles:

First, there is a "light in the soul that is uncreated and
uncreateable": unconditioned, universal, deathless, in
religious language, a divine core of personality that cannot
be separated from God. Eckhart is precise: this is not what the English language calls the "soul," but some essence in the soul that lies at the very center of consciousness. ... In Indian mysticism this divine core is called simply atman, "the Self".

Second, this divine essence can be realized. ... It can and should be discovered, so that its presence becomes a reality in daily life.

Third, this discovery is life's real and highest goal.

Last, when we realize this goal, we discover simultaneously that the divinity within ourselves is one and the same in all --- all individuals, all creatures, all of life.

Easwaran also describes this "little spark in the soul" as a "divine seed" and quotes Origen:

because it is God that has sowed the seed in us, pressed it in,
begotten it, it cannot be extirpated or die out; it glows and
sparkles, burning and giving light, and always it moves
upward toward God.

And then Eckhart again:

The seed of God is in us. Given an intelligent and hard-working farmer, it will thrive and grow up to God, whose seed it is, and according its fruits will be God-nature. Pear seeds grow into pear trees, nut seeds into nut trees, and God-seed into God.

The signs of this God-nature, according to Easwaran, include: compassion, fearlessness, and equanimity. Easwaran goes on to say that Original Goodness

does not deny what traditional religion calls sin; it simply
reminds us that before original sin was original innocence.
That is our real nature. Everything else - all our habits,
our conditioning, our past mistakes - is a mask. ... But the
nature of a mask is that it can be removed. This is the
promise and the purpose of all spiritual disciplines: to take
off the mask that hides our real face.