We all have fuel inside, ready to be lit, ready to burn. It can burn with anger, pleasure, hatred, jealousy, craving, etc. When lit it burns the mind and body, though many do not realise it. It’s hard to speak and act wisely when on fire.
Some people’s fire is lit with the tiniest spark, like a pile of dry straw. Others take more to light, like a pile of heartwood logs.
When we practice the dharma we aim to douse our fuel with cool waters allowing us to keep a mind of compassion and equanimity even when standing amongst a blaze.