Every time we justify our behaviour we are acting out of Pride. Pride is a debilitating self defeating ego driven behaviour stopping us from growing spiritually (when we place ourselves above others by justifying our behaviours for example, or when we carry on believing, sometimes for years with disastrous results - see the compulsive obsessive behaviour of an addict for example whom despite the evidence of the contrary he still thinks he can control - or even stop - his drinking, or gambling or drug using - that we can overcome a problem or achieve something with the only force or our self will) and that stops us from achieving what we most desire in life (regardless of what this is).
Pride will stop us from trying again when we do not get what we want at the first try, or will stop us from admitting defeat, pride will prevent us to see our true nature, will stop us to see our part in a controversy, or from searching inside ourselves to find the truth of our feelings or of the emotional defects which are preventing us from growing as human being and feel fulfilled.