Some years ago when I had finally managed to calm down my own life, I sat down to get a feeling for the balance of the world in terms of destruction/construction and chaos/order, and based on my experiences I felt like the destructive side was winning. With many points and factors in consideration, I eventually decided I believed in three things (that were also rationally sound to me).
A: I, and every person, has the power to influence this balance and therefore which way the world progresses.
B: Any kind of change is better than stagnation because the potential for something is always better than no potential.
C: In the end, constructiveness and order can achieve more than their opposite.
From then on, I made an effort to help people whenever I could and over the years I ended up saving several lives.
If you believe in A, you believe humanity has power (the potential to influence the state of things).
If you believe in B, you can judge yourself and others for not doing anything.
If you believe in C, you can judge yourself and others for not doing good deeds.
Without doing any good deeds, you can't influence the state of things and therefore can't be a good person. However, someone who believes in goodness and wants to be good almost always influences others around them through example or simply through communication. This is a good deed since it carries the potential for positive change, so not doing any good deeds when you're a good person is rather difficult.
With all that said, it's not always possible to devote yourself to good deeds because your own life might not be in order yet. This is where empathy and understanding come in to suspend your judgement until a later time. Additionally, there's the question of how much you should demand of a person for them to earn the quality "good". On one hand, extremely few of us use all of our potential for good or even against stagnation. On the other hand, devoting yourself too much can affect you negatively because of neglect of yourself. It's a balancing act that only each individual can perform and be aware of.