What is the meaning of Ahimsa parmo dharma?

Non-injuring in thought, word and deed is the highest of all virtues.” If one is well established in Ahimsa in thought, word and deed, he can never do any wrong action. That is the reason why Patanjali Maharshi has given Ahimsa great prominence in his Raja Yoga philosophy. Ahimsa comes first in the practice of Yama or self-restraint. To give happiness to others is right; to spread misery and pain to others is wrong. One can follow this in his daily conduct towards others and can evolve in his spiritual path. Do not perform any act that brings to you shame and fear. You will be quite safe if you follow this rule. Stick to any rule that appeals to your reason and conscience and follow it with faith and attention. You will evolve and reach the abode of eternal happiness.