Nature is not cruel, pitiless, indifferent. This is one of the hardest lessons for humans to learn. We cannot admit that things might be neither good nor evil, neither cruel nor kind, but simply callous -- indifferent to all suffering, lacking all purpose. - Richard Dawkins
Nature is cruel and pitiless, so are successful states and people - Habyarimana Bangambiki
Force is as pitiless to the man who possesses it as it is to its victims - the second it crushes, the first it intoxicates. The truth is that nobody really possesses a great kind of power for long. Those who have it on loan from Fate count on it too much and are themselves destroyed. - Paul Hoffman
Speak well of the sun, but know that it can harm you;when enraged, it is pitiless. Speak well of the ocean, but know that it can injure you; when angry, it is merciless. Speak well of the wind, but know that it can wound you; when provoked, it is ruthless. - Matshona Dhliwayo