The fact that nothing is certain in our universe is something most people realize at a really early part of their lives. At least the famous saying 'change is the only constant' is something many people are familiar with. Certainty can be defined as the highest form of knowledge or truth. Science uses variables and probability theories to evaluate the truth but so far, it has only been able to generate approximate results, in many cases. Sophistication and development across the world has increased by leaps and bounds, but mankind isn't certain about several other questions that has been haunting everyone for long. The time of death, the presence of the divine and the paranormal are few questions for which people are still looking for answers.
It is widely believed that there are three kinds of certainty. Firstly, it would be certainty due to belief in which the person’s belief is incorrigible thus making it certain. The second kind is epistemic, which can be explained as a validated belief. The third kind is moral certainty, this includes any belief or practices that are justified by the morals set by the society, which could also be unpractical many a times. Therefore, it is always suggested to standout and question rather than follow, just to prevent the illusion of certainty. In an average human life, sadness and happiness are certain with a strange balance of both. Reading these quotes will give you a better insight about certainty.