A Passage From The Upanishads, Eknath Easwaran:
In the city of Brahman is a secret dwelling, the lotus of the heart. Within this dwelling is a space, and within that space is the fulfillment of our desires. What is within that space should be longed for and realized.
As great as the infinite space beyond is the space within the lotus of the heart. Both heaven and earth are contained in that inner space, both fire and air, sun and moon, lightning and stars. Whether we know it in this world or know it not, everything is contained in that inner space.
Never fear that old age will invade that city; never fear that this inner treasure of all reality will wither and decay. This knows no age when the body ages; this knows no dying when the body dies. This is the real city of Brahman; this is the Self, free from old age, from death and grief, hunger and thirst. In the Self all desires are fulfilled.
The Self desires only what is real, thinks nothing but what is true. Here people do what they are told, becoming dependent on their country, or their piece of land, or the desires of another, so their desires are not fulfilled and their works come to nothing, both in this world and in the next. Those who depart from this world without knowing who they are or what they truly desire have no freedom here or hereafter.
But those who leave here knowing who they are and what they truly desire have freedom everywhere, both in this world and in the next. Would they see their departed mother or father? Lo, they see them and are happy.
Would they see their family and friends? Lo, they see them and are happy. Would they enjoy the world of music, of spring flowers, of elegance? Lo, by their mere will they enjoy these things. Whatever they desire, the object of that desire arises from the power of their own thoughts; they have it and are happy.
Here our selfless desires are hidden by selfish ones. They are real, but they are covered by what is false. Therefore whoever of our own departs from this life, not one can ever be brought back before our eyes.
But all those we love, alive or departed, and all things we desire but do not have, are found when we enter that space within the heart; for there abide all desires that are true, though covered by what is false.
Like strangers in an unfamiliar country walking over a hidden treasure, day by day we enter the world of Brahman while in deep sleep but never find it, carried away by what is false.
The Self is hidden in the lotus of the heart. Those who see themselves in all creatures go day by day into the world of Brahman hidden in the heart. Established in peace, they rise above body-consciousness to the supreme light of the Self. Immortal, free from fear, this Self is Brahman, called the True. Beyond the mortal and the immortal, he binds both worlds together. Those who know this live day after day in heaven in this very life.
The Self is a bulwark against the confounding of these worlds and a bridge between them. Day and night cannot cross that bridge, nor old age, nor death, nor grief, nor evil nor good deeds. All evils turn back there, unable to cross; evil comes not into this world of Brahman.
One who crosses by this bridge, if blind, is blind no more; if hurt, ceases to be hurt; if in sorrow, ceases sorrowing. At this boundary night itself becomes day: night comes not into this world of Brahman.
Only those who are pure and self-controlled can find this world of Brahman. That world is theirs alone. In that world, in all the worlds, they live in perfect freedom.
Easwaran, Eknath. The Upanishads (Easwaran’s Classics of Indian Spirituality) (S.142-144). Nilgiri Press. Kindle-Version.