There's a enormous stress out in the real world as people attempt to
raise families and live their lives. The text only mentions stress that
comes from within the family, between husband and wife.
But there are forces outside the family that work to break it apart.
Unfortunately, when marriages fail, the family members often blame
themselves.
Think about this table:

Stressful events can occur inside the family, due either to normal day-to-day living, or because of abnormal conditions.
They can also come from outside the family, in the course of normal world conditions, or because of abnormal ones.
Quite often the symptoms of Abnormal stress are the same as Normal stress, depending on the courage and fortitude of family members. Similarly, Outside causes of stress can cause damage to the family even though they are the fault of no one in the family.
Also, some families seem to do well when under severe abnormal stress, while others can't seem to withstand the slightest snag in their routine. While being socialized, some people experience more of life, and therefore have more experience to draw on in times of crisis. Others are sheltered more from life's experiences, and have less to use when faced with tough times.
The moral of the story is this:
The Issue of Power in Marriage:
Power is the ability to get another person to think, feel, or do something they would not have ordinarily done spontaneously. If one possesses the means to affect another, one has power vis-a-vis that person. If one uses one's power, it is called influence. If one's influence is successful, it is called control.
Each person in a relationship has some power. It might be skewed to
one person or the other.
To unfairly use one's power constitutes an injustice in a marriage.

It is one thing, as the text suggests, to get one's spouse to clean
out the garage.
It is quite another to get one's spouse to engage in behavior that
are against their moral or ethical code. In order to maintain the balance
of power in a marriage relationship, the partners must constantly work
towards equality in the marriage.
I. Areas of Conflict - conflict is a direct result of power struggles in marriage.
B. Rejection and Betrayal - resulting in
B. Permissive Acceptance - always giving in
C. Passive Aggression - "You go on, I'll just sit here - ALONE!" - "Well, if you really want me to come with you..."
D. Evasion
E. Honest Resolution - the only strategy that has lasting positive results is this one.
B. Active Listening - Focus your whole attention on the other while they explain their complaints. Make gestures that communicate understanding Occasionally stop the explanation and clarify.
C. Attacking the Source of the Conflict and not the person.
D. Role Taking - actually put yourself in the other person's place. Restate the problem from the other's point of view.
E. Comparing Mutual Goals
Acitelli, A., Douvan, E., & Veroff, J. (1993). Perceptions of conflict in the first year of marriage: How important are similarity and understanding? J. Social & Personal Relationships, 10, 5-19. Perceived similarity between spouses is greater than actual similarity of responses within both contexts of constructive and destructive conflict behaviors. Destructive behaviors were found to be more accurately perceived, and wives' marital well-being tended to be affected more by perceptual congruence variables.
Boss, P.G. (1980). Normative family stress: Family boundary changes across the life-span. Family Relations, 29, 445-490.
Callan, V.J. (1987). the personal and marital adjustment of mothers and of voluntarily and involuntarily childless wives. JMF, 49, 847-856. Levels of personal well-being for the three groups were similar across indices. However, infertile women had lower global levels of well-being and rated life as less interesting, emptier and less rewarding. They were less satisfied than other women with the amount of success, interest, variety and fulfillment.
Cohen, T.F. (1987). Becoming and being husbands and fathers: Work and family conflict for men. J. Family Issues, March. The weight of the evidence obtained here suggests men's lives contains greater attachments to marriage and family that is usually assumed. Their lives are remade after beginning roles as husbands and fathers - self-concepts recast in the process. The actual data suggests a reinterpretation of old notions about men's lives.
Hannan, K. & Eggebeen, d. (1995). Stressful events and changes in the home environment. Family Perspective, 29(2), 193-207.
Harper, S., Anderson, R. (1993). Stress and family health. Contemporary Family Therapy, 15(2), 169-178. Individuals in balanced and extreme families were very similar in their perception of everyday stress levels.
Kurdek, L.A. (1991). Predictors of increases in marital distress among newlywed couples: A 3 year prospective longitudinal study. Developmental Psychology, 27, 627-636. Poor, uneducated, and young respondents are likely to show a linear increase in marital distress over time.
Marotz-Baden, R. & Mattheis, C. (1994). Daughters-in-law and stress in two-generation farm families. Family Relations, 43, 132-137. The combination of problematic integration into both the extended family and the farm family business contributed most to stress levels in daugthers-in-law.
Lavee, Y., & Olson, D. (1991). Family types and response to stress. JMF, 53, 786-798. Some of the relationships among the variables apply across the four types of family systems. marital strength was affected by intrafamily strain and was related to perceived coping resources. Effects of stressful life events and normative changes on family functioning and well being appeared to be related to the family's system type.
Weist, M., Freedman, A., Paskewitz, D, Proescher, E., & Flaherty, L. (1995). Urban youth under stress: Empirical identification of protective factors. J. Youth and Adolescence, 24 (6). For boys, family cohesion was the only variaoble found to protect against the effects of stress. For girls, family cohesion was not significant, but problem-focused coping was. Low family cohesion, along with social stress, was associated with increased vulnerability to school problems. for both, an external locus of control was associated with increases in vulnerability to life stress, and increased the likelihood of risk taking behaviors.