There's no such thing as advice to the lovelorn. If they took advice, they wouldn't be lovelorn.

We are never so generous as when giving advice.

I realize that advice is worth what it costs — that is, nothing.

There is nothing which we receive with so much reluctance as advice.

Advice doesn't cost anything - unless you follow it.

Nobody can give you wiser advice than yourself.

No enemy is worse than bad advice.

Never take advice!

On one level, wisdom is nothing more profound than an ability to follow one’s own advice.

There is no wisdom like frankness.

There is nothing to be learnt from a Professor, which is not to be met with in Books.

Nothing can be imagined which is too strange or incredible to have been said by some philosopher.

The most common bad advice I hear is: “You’re too young.” Most of history was built by young people. They just got credit when they were older.

People offer advice, but they do not give at the same time the wisdom to benefit from it.