"As it is said in the sutras:

Abandon evildoing;
Practice virtue well;
Subdue your mind;
This is the Buddha's teaching.

We should avoid even the smallest negative actions, and we should perform even the most insignificant positive actions without underestimating their value. The reason for this is that the happiness we all want and the sufffering we all try to avoid are produced precisely by our actions, or karma".

His Holiness The Dalai Lama,
A Flash of Lightening in the Dark of Night