Not the faults of others,

nor what others have or have not done;

One should observe one’s own actions,

deeds, both done and not done.

– DhammaPada Verse 50

Related Teachings:

On Wise Attention | A Trainee - First (ITI 16) - Wise attention or proper and careful attention is a quality of the mind that comes to growth and maturity as one continues learning, reflecting and applying the teachings in practice. It is one of the four factors that leads one to awakening to the truth of enlightenment, to stream-entry.

Causes for the arising and expansion of the five hindrances (AN 1.11 - 20) - The Buddha explains what causes the hindrances to arise and how to abandon them.

Navigating through 30 mental qualities that lead to enlightenment, to the arising of the Buddha (AN 10.76) - The Buddha lays down 30 different mental qualities in ten sets of threes that lead all the way to enlightenment. He explains them both backwards and forwards. One can use this teaching to draw out a skill map of which qualities they’ve cultivated and which ones are next to cultivate.