'Do not say: "I do not know what is right, therefore I am not to blame when I fail to do it." For if you did all the good about which you do know, what you should do next would then become clear to you, as if you were passing through a house from one room to another. It is not helpful to know what comes later before you have done what comes first. For knowledge without action "puffs up", but "love edifies", because it "patiently accepts all things" (1 Cor. 8:1; 13:7).'
St. Mark the Ascetic
I could read this a thousand times.
This is one I really have to print off and hang it in a prominent place.
The 'passing through a house from one room to another' stays with me. I would know what I should do, if I had done what I should have done. So I must do what should be done in the present moment.
And this too.