Name.

"the name used most often for G-d in jewish texts is also the most mysterious and intimate. in hebrew it's actually a word with no consonants and all vowels. it's unpronounceable. when you try to say it, you hear the sound of a breath, a simple exhale. what is the teaching? the name of G-d is not meant to be uttered, but to be breathed."

He was what He was.
He is what He is.
He will be what He will be.

blessed be the Name.

excerpts quoted from rabbi irwin kula.