Quote
"In a detached person nothing merely temporal is born in possessiveness. His eyes are opened. He becomes fully aware and, receiving his blessed existence and life, is one with Him; for all things are here one in the One."
"No one can explain this to another just with words. One knows it by experiencing it."

Henry Suso, OP was a German Dominican friar and the most popular vernacular writer of the fourteenth century. An important author in both Latin and Middle High German, he is also notable for defending Meister Eckhart's legacy after Eckhart was posthumously condemned for heresy in 1329. He died in Ulm on 25 January 1366, and was beatified by the Catholic Church in 1831.
"In a detached person nothing merely temporal is born in possessiveness. His eyes are opened. He becomes fully aware and, receiving his blessed existence and life, is one with Him; for all things are here one in the One."
"It is hidden for everything that is not God, except for those with whom he wants to share Himself."
"Eternity is life that is beyond time but includes within itself all time but without a before or after. And whoever is taken into the Eternal Nothing possesses all in all and has no before or after. Indeed a person taken within today would not have been there for a shorter period from the point of view of eternity than someone who had been taken within a thousand years ago."
"After this the disciple turned again in all seriousness to eternal Truth and asked for the power to discern by outward appearance a person who was truly detached. He asked thus. Eternal Truth, how do such people act in relation to various things? Answer: They withdraw from themselves, and all things withdraw along with this. Question: How do they conduct themselves with respect to time? Answer: They exist in an ever-present now, free of selfish intentions, and they seek to act perfectly in the smallest thing as in the greatest."
"Here in this region beyond thought the human spirit actively soars."
"Be steadfast and never rest content until you have obtained the now of eternity as your present possession in this life, so far as this is possible to human infirmity."