Scientific knowledge is in perpetual evolution; it finds itself changed from one day to the next.

What is desired is that the teacher ceased being a lecturer, satisfied with transmitting ready-made solutions. His role should rather be that of a mentor stimulating initiative and research.

Every time we teach a child something, we keep him from inventing it himself. On the other hand, that which we allow him to discover for himself will remain with him visible for the rest of his life.

When you teach a child something you take away forever his chance of discovering it for himself.

Knowing reality means constructing systems of transformations that correspond, more or less adequately, to reality.

The self thus becomes aware of itself, at least in its practical action, and discovers itself as a cause among other causes and as an object subject to the same laws as other objects.

Scientific knowledge is in perpetual evolution; it finds itself changed from one day to the next.