Hello friend @vieira. Very good reflection between knowledge and definition. From my experience, true knowledge is that in which a close link is established between theory and practice. It is not enough to know the concept, but also, it is necessary its representation, it is very difficult to represent an object that we have never seen, so it would be very exposed to human subjectivity.
Knowledge is as diverse as people are diverse, that is why it has the sign of diversity.
What is beautiful for you, is not for me, so it is also important the concept to establish our own conclusions.
Thank you friend, for allowing me to reflect with your post. Greetings