Not much need be said about this word or concept. It simply signifies satisfaction. There are actually beautiful phrases in the scriptures that can apply:
In referring to one's grain container being filled for purchase, "Shaken, pressed down, and overflowing".
And, "Eye hath not seen, ear hath not heard".
Need, here, is being defined as that which is necessary for the sustenance of life, and desire is being defined as that which is necessary for the enhancement of life.
Human beings do NOT have needs and desires that are infinite though they be eternal. Our limited requirements CAN be satisfied. The problem with our experienced reality now is that "our reach exceeds our grasp", the limits of what is realistic are more narrow and constrictive than the range of our needs and desires. That we can never be satisfied is not a problem with our nature but with our current reality.
It is the increase of appetite and its fulfillment that gives us much pleasure in life. When the level of fulfillment is too low, we suffer either physically or psychologically. How wonderful it would be to be satisfied and not have to chase after and worry about getting the things we want and need to sustain and enhance our lives.
Every human being has a natural and legitimate desire and need for fulfillment.