The core value of Jainism is to be of service to one another expressed through the phrase Parasapagraho Jivanam. Jainism classifies living beings into various categories from having one to five senses. Categories of living beings include plants and trees (vanaspatikaya), air (vayukaya), water (apkaya), fire (teukaya), and soil-earth (prithvikaya), and are the lowest category of living beings. Humans and mammals with five senses are a part of the highest category of living beings.