Foresight is based on a correct understanding of causality and a scientific speculation of unknown facts. Just as people explain known facts, it deduces the conclusion of stating facts from universal principles and antecedents. Scientific foresight is based on science's judgment on the development trend of objective things, and also on causality, speculating on the unknown scientific facts in the research, so as to grasp the future trend of the facts. For example, according to the scientific theory of the periodic law of chemical elements, Mendeleev foresaw the possible existence and physical and chemical properties of new elements that had not been discovered at that time. It is based on the regularity of the development of objective things, which has been tested in practice and may become a reality.
Generally speaking, scientific foresight has only relative significance, but no absolute nature, which is determined by the complexity of the development and change of things. Usually we can accurately predict the fixed trend of simple things, but it has no practical significance. However, when we face the development trend of a complex phenomenon, especially the uncertain trend, it is of great significance and difficult, and the prediction results are often not very accurate. For example, we can't accurately predict nature, whether it is weather forecast related to daily life or natural disaster forecast related to life safety. Although modern science and technology are very advanced and all kinds of measuring instruments are more accurate, we still can't make a scientific prediction because of the rapid changes in nature.
Although scientific foresight is of relative significance, we can't take it lightly in the process of scientific foresight, and our thinking is still developing freely. Scientific foresight first requires us to follow the objective laws of things, which is the objective premise of scientific foresight. Everything develops and changes according to certain laws. Therefore, only on the basis of understanding the internal objective laws of things can people's foresight be truly scientific. Without grasping the objective laws, the so-called foresight is nothing more than myth or subjective imagination. Secondly, we should fully understand the conditions for the existence and development of things. All kinds of objective laws that people know have their specific scope of application. Even if it is a universal law, it must have different forms of expression under different conditions. Therefore, it is necessary to analyze specific problems, which is well-founded and appropriate. Finally, when people apply the universal law to individual things and try to judge the development trend of things, they should also correctly estimate and solve the contradiction between the universal and the individual, which requires a correct way of thinking, no deviation and no subjective judgment.