Belief strength should scale with information and evidence. By knowing the areas in which you have a strong base of knowledge and those where you don't you can avoid being unintentionally dishonest, and promoting detrimental action.
The easiest person to fool is yourself. By closely examining your beliefs, and criticizing your actions you can avoid being hypocritical. Being your best cheerleader helps keep momentum in the face of adversity. Truly believing in the import of your actions helps motivation.
In systems where oppression is institutionalized (patriarchy, white supremacy, etc.), the privileged class is taught they they have a "right" to the benefits that are conferred upon them. But a "right" is something everyone should have.
We should only compare ourselves with the person we were yesterday. Making the world a better place starts with the person in the mirror. We are all capable of improving the world around us by sharing our creativity & knowledge or by simply relieving the suffering of others.
People who work hard for the benefit of others deserve to be rewarded for their efforts. We do not automatically have a claim on the hard work and dedication of others.
By reflecting upon what memories you would like have when you look back at your life you may find out what is important to you and you will be able to take deliberate steps towards creating those memories.