is it necessay to have mutual understanding between life partners?

A marriage is a relationship between or among individuals, usually recognized by civil authority and/or bound by the religious beliefs of the participants. The fact that marriage often has the dual nature of a binding legal contract plus a moral promise can make it difficult to characterize. A married couple can be called each other's spouses, and spousal is used as a legal term for the marital relation. A royal married couple are consorts. Its not just a relation that is for a time period but it s a relation which lasts forever... In hindus it is a relation that exists till 7 births.. So understanding shuld be there... Type of understanding is irrelevant because it dpends on the pair itself...