No one who works in parenting education can escape dealing with the effects of divorce on children. It's too simplistic for me to tell you not to have children if you ever plan to divorce. Everybody knows that people change, relationships change, and some marriages are made in hell, not heaven. But my first bit of advice to all parents is:

TRY TO MAKE YOUR MARRIAGE WORK.

If divorce is the best or only solution, protect your children by following the Heins Rules for Divorcing Parents:

Both parents must tell the child repeatedly that:
1) The divorce is NOT THE CHILD'S FAULT.
2) It's OK TO LOVE BOTH PARENTS.
3) It's OK TO FEEL SAD AND ANGRY because the family is breaking up. There's no way that divorce–which has been referred to as "social surgery"–can be painless. Encourage the children to express their feelings. If they don't talk about it ask them how it hurts and help them deal with the pain.
4) There's nothing to be ashamed about, the divorce is between the parents. Be sure to help the child tell others about the divorce. Sometimes children are embarrassed and don't know what words to use to tell their teacher or friends.
5) "You will always be taken care of." and "We will both love you for always."