1. optional - Noun
2. optional - Adjective
Involving an option; depending on the exercise of an option; left to one's discretion or choice; not compulsory; as, optional studies; it is optional with you to go or stay.
See Elective, n.
Source: Webster's dictionaryPain is inevitable. Suffering is optional. Haruki Murakami
I've always thought a hotel ought to offer optional small animals. I mean a cat to sleep on your bed at night, or a dog of some kind to act pleased when you come in. You ever notice how a hotel room feels so lifeless? Anne Tyler
Nothing optional -- from homosexuality to adultery -- is ever made punishable unless those who do the prohibiting (and exact the fierce punishment) have a repressed desire to participate. Christopher Hitchens
Where there is happiness, there is found pleasure in nonsense. The transformation of experience into its opposite, of the suitable into the unsuitable, the obligatory into the optional (but in such a manner that this process produces no injury and is only imagined in jest), is a pleasure. Friedrich Nietzsche
If priests were allowed to marry, if this would be an optional thing, and if he could have wife and children, he would certainly have less temptation to satisfy certain sexual impulses with minors. Hans Küng
Pain is inevitable suffering is optional. African Proverb