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The most common complaint of singles is that they are lonely. God didn't design us to live in isolation. Intimacy is one our deepest needs. If you're single, invest your time with others. It's the language of friendship.
The opposite of gratitude is not ingratitude. It's worry.
How fluent are you in the language of prayer?
As couples grow older, it's not unusual for them to withhold intimacy from each other. This is unhealthy. If you can determine why your spouse avoids intimacy, it's important to get to the root of the problem.