Asking, is that we may get healthiness of soul that we may be able to fulfil the things commanded us; seeking, pertains to the discovery of the truth. But when any has found the true way, he will then come into actual possession, which however is only opened to him that knocks.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Serm. in Mont., ii, 21