If, in everyday life, you are asked about continued existence after death by one of those people who would like to know everything but refuse to learn anything, the most appropriate and approximately correct reply is : ‘After your death you will be what you were before your birth.’ For this answer implies that it is preposterous to demand that a species of existence which had a beginning should not have an end; in addition, however, it contains a hint that there may be two kinds of existence and, correspondingly, two kinds of nothingness.
— Schopenhauer (via thewholeblinkingcosmos)
Existence. It can be doubted very much whether existence is a perfection or degree of reality; for it can be doubted whether existence is one of those things that can be conceived — that is, one of the parts of essence; or whether it is only a certain imaginary concept, such as that of heat and cold, which is a denomination only of our perception, not of the nature of things. Yet if we consider more accurately, [we shall see] that we conceive something more when we think that a thing A exists, than when we think that it is possible. Therefore it seems to be true that existence is a certain degree of reality; or certainly that it is some relation to degrees of reality. Existence is not a degree of reality, however; for of every degree of reality it is possible to understand the existence as well as the possibility. Existence will therefore be the superiority of the degrees of reality of one thing over the degrees of reality of an opposed thing. That is, that which is more perfect than all things mutually incompatibles exists, and conversely what exists is more perfect than the non-existent, but it is not true that existence itself is a perfection, since it is only a certain comparative relation [comparatio] of perfections among themselves.
— Leibniz in Determinist, Theist, Idealist by Robert Merrihew Adams.
Being is what can exist and, consequently, that with which existence is not incompatible
— Christian Wolff, Philosophia prima sive Ontologia (1730)
To know what existence is, all we have to do is to understand the meaning of the word, for it tells us at once what the thing is which the word stands, for, in so far as we can know it. There is no need here for a definition, which would confuse rather than clarify the issue
— René Descartes, Recherche de la Verité
A man who becomes conscious of the responsibility he bears toward a human being who affectionately waits for him, or to an unfinished work, will never be able to throw away his life. He knows the “why” for his existence, and will be able to bear almost any “how”.
— Viktor E. Frankl