Finitude, Infinity and Eternity

Finitude has a beginning and an end.
Everything that is limited, for example a human life on earth, is finite.

Infinity has a beginning but no end.
For example, the universe begins (according to the most widely recognised theory) with the primal big bang and expands infinitely far.
The development of forms and consciousness in this universe takes place on the earth and began with the emergence of life. Its end is unforeseeable.

Eternity has no beginning and no end.
This is the world of the ideas (according to Plato) that have not yet appeared. Every thing, every essence exists here only once, as a primal idea. We look at the level of the principles, the world of transcendence.