I'm a Man of the Cloth
There is an easy method to ensure you are delivering a straight stroke and also look at the cue ball at the same time. It is like a "one-foot focus" zone. Maybe I should call it OFF!
I use it all the time when I break and lots of times when I have long straight-in or difficult shots. I will pick my line and contact points while I'm still standing and then I will look from the contact point on the object ball all the way back to the cue ball. I look for any chalk spots, lint, etc. that are on the table on the SAME line. I then look for the closest imperfection in the cloth that is closest to the cue ball on the same line.
THAT becomes my line. I can get up, go to the bathroom, drink a cup of beverage, or whatever, but when I come back (unless I regroup and start over) that is my aiming point.
Now when I get down, I may take one last look down the line to see if I'm in alignment. If I am, then my total focus is on that "one-foot focus" zone where I can see the last foot of my bridge, the tip, and contact point on the cue ball, and the piece of "lint/imperfection/etc." that I'm trying to extend my tip through.
After a few practice strokes, I try to go "through" the cue ball and watch my tip as it goes for the "spot" on the table I am reaching my tip out for.
It is kind of like using the arrows and boards on the lane when bowling. If my ball is going in a straight line and over the spot I am aiming at, I have no control of what happens next.
Aloha.