Irreconcilable differences that preclude a successful relationship

Those who are considering marrying someone should think very carefully about it if you disagree on the following topics:

Having children. Disagreement on this is a total relationship killer and cannot be reconciled in the course of marriage. One of you will always feel either coerced into parenthood or deprived of motherhood/fatherhood. One of you will always end up carrying a toxic grudge that, in the former case, will also affect the children. Unfortunately, many new couples postpone the discussion, because they feel it's too hot a topic to handle at the early stages of the relationship.

Religion. A mixed pair with one partner a believer and another atheist (or a follower of another religion) will be under strain. If there are no children, it can be dealt with an agreement between two adults ("you can practice your religion and I can choose to practice my own or not any religion at all"). However, when raising children the differences can become irreconcilable.

Politics. Strong liberal and strong conservative streaks don't mix in a family. Once again, if there are no children, the couple may compromise by agreeing not to engage in political discussion at home. However, raising kids will once again make conflict unavoidable and probably irreconcilable.

Love does not conquer all.