It is sometimes claimed that Niels Bohr gave up on the idea of understanding the quantum world. Nothing could be further from the truth.
“The resignation as regards visualization and causality, to which we are thus forced in our description of atomic phenomena, might well be regarded as a frustration of the hopes which formed the starting-point of the atomic conceptions. Nevertheless, from the present standpoint of the atomic theory, we must consider this very renunciation as an essential advance in our understanding.” (Bohr 1934 p 115)