"As for the Standard Model, we now know that the roles of asymptotic freedom, monopoles, and instantons are crucial in our present picture of quark confinement, the hadron spectrum, the scaling phenomena, and jet physics. The renormalized theory allows us to reproduce the observed data on the Z and W bosons with unprecedented precision. The Standard Model, as a gauge theory with fermions and at most only one scalar, is indeed tremendously successful."
January 1, 1970
https://en.wikiquote.org/wiki/Standard_Model