A friend in power is a friend ...

A friend in power is a friend lost.
 Henry Adams

Quotes from the same author

In correct theology, the Virgin ought not to be represented in bed, for she could not suffer like ordinary women, but her palace at Chartres is not much troubled by theology, and to her, as empress-mother, the pain of child-birth was a pleasure which she wanted her people to share.
 Henry Adams
Power when wielded by abnormal energy is the most serious of facts.
 Henry Adams
Absolute liberty is absence of restraint; responsibility is restraint; therefore, the ideally free individual is responsible to himself.
 Henry Adams
Average human nature is very coarse, and its ideals must necessarily be average. The world never loved perfect poise. What the world does love is commonly absence of poise, for it has to be amused.
 Henry Adams
Mathematicians practice absolute freedom.
 Henry Adams