Sacrifice more if you want to have the initiative Standard Chess

It frequently happens that the initiative can only be seized or maintained by drastic measures such as the sacrifice of a pawn or piece, or a complex combinative regrouping. If we do not resort to these measures in time, the initiative may not only slip away from us – it will very often cross over to our opponent, since the initiative in chess does not like to remain homeless.
– Isaac Lipnitsky, Questions of Modern Chess Theory

…positional sacrifices are well known to be the most difficult ones. In each particular case the decision basically depends not so much on calculation as on our experience, intuition and faith in our own powers.
– Isaac Lipnitsky, Questions of Modern Chess Theory