In plain words
There is none on earth who knows all things; and who is there who knows nothing at all? One who knows a little is a man of little knowledge; the one who knows everything is Sai alone.
Do the tanks fill as soon as a few drops fall? Does the belly grow by holding the breath? Is thirst quenched by swallowing spit? Does burning hair make charcoal?
Students!
Our daily life begins with sunrise and ends with sleep after sunset. The daily life of every human being in Prakṛti, too, rests on nothing but the turning of the earth. The sun always rises in the east. It sets only in the west. Our belief is that when the sun comes up above the horizon it is morning, and that once it has gone down below that circle it is night. Noting the natural conditions of these two, we fix for ourselves the directions north and south. With the heat and cold of the different countries, too, people draw near the sun's path, live through their own conditions, recognise the place where they stand, and so conceive of the directions called west and north. This is what human beings experience naturally in daily life, with a belief that it is true.
When we look into it from another angle, we hold that the earth is a sphere. For a man who believes it is a sphere, it has no east or west, no north or south, no sunrise or sunset. In our experience of these two we see results that contradict each other. The scientist recognises the truth that it has no east or west, no north or south. For the man who believes …, there is no room at all to cast aside the first truth. A scientist may believe that the earth is a sphere, that it has no day and night and no north and south; even so, in daily life we experience what we call sunrise and sunset. Here experience itself is the chief proof, but research joined with observation has no proper standing at all in what we experience.