It is often missed, but should be underscored: Paul needed the prayers of others (II Cor. 1:8-11).  He was “despairing even of life.”  At another low moment, he greatly benefited from the encouragement of Titus (II Cor. 7:6). 

I have often shared the following to Christians who are so deeply troubled they can’t even muster the motivation to pray:  Don’t worry.  Simply ask others to pray for you.  Give us the privilege of holding you up.  You may need to return the favor someday!