"What is called a sincere work is one that is endowed with enough strength to give reality to an illusion"

This quote by Max Jacob speaks to the power of creativity and art. It recommends that a genuine work of art is one that is strong enough to bring an impression to life. This could suggest that a genuine masterpiece is one that is so effective and convincing that it can make the viewer believe in something that isn't genuine. It could likewise mean that a genuine masterpiece is one that is so vivid and detailed that it can transfer the audience to a various world. In either case, Jacob is highlighting the value of creating art that is strong and powerful enough to evoke feeling and develop a lasting impression. He is recommending that art must be created with the objective of making a long lasting impact on the viewer.