Normally, philosophy teaches us new ways of thinking but rarely does it provide us with ways to live.
A true human is he who doubts yet is man enough to admit his mistakes. 
A living philosophy sees the world as it is, without any color of belief or ideology.

A Living Philosophy

David Hume understood that the various beliefs and ideologies that sound reasonable and logical on the surface, are in fact irrational and emotionally driven deep down. This way he could argue about or doubt practically any belief or thought process.

The Limits of Reason and Logic

David Hume argued that we can't always be selfish and self-centered as we are ultimately unable to live without other people.If we do wrong to someone, the unbiased spectator in us (conscience), will see that, providing us feelings of guilt, or remorse.

The Unbiased and Unselfish Spectator

The philosophy of the Scottish philosopher David Hume wasn't just about being disagreeable. He was skeptical and doubtful on authority, and on himself too.He could highlight flaws on both sides of the argument, his side and the opponent's side. His balanced and practical intellect made him a rare historical figure.

David Hume: Both Sides of the Coin

David Hume was completely at ease with contradictions. This way he could avoid getting into extremities. He used to contradict himself by providing a counter-argument against his own statements. This way, no matter how contradictory it sounded, it provided an insight into life, which itself does not follow a linear, logical path.

At Ease with Contradictions

If you judged David Hume the man by his philosophy, you may judge him as disagreeable. He was a Scottish philosopher who epitomized what it means to be skeptical - to doubt both authority and the self, to highlight flaws in the arguments of both others and your own.