Lama Zopa Rinpoche's Online Advice Book
Many of Lama Zopa Rinpoche's advices mention the importance of respecting all life, doing all we can to avoid harming and killing sentient beings.
Rinpoche emphasizes the importance of not harming animals and insects, treating them as beings like ourselves who desire happiness and want to avoid suffering, and explains the negative karmic effects of killing.
The best solution, advises Rinpoche, is to develop one's mind on the path and attain enlightenment as soon as possible to liberate all beings from suffering. At the same time, always practice not harming others, and benefit them as much as one can.
See also in the Emotions section: