English:
We know there is a G-d because we were there when He revealed Himself. But even people who weren't there are coming to that conclusion.
Hebrew:
A gadol shebigdolim on doing a mitzva in a bi-dieved way - lichtchila [bi-dieved means "after the fact" so normally one can't do it bi-dieved - lichtchilah], making a tnai for Krias Shma, hearing the words you say, sitting within the 4 amos of someone davening and much more. Beyond geshmak.
Another tremendous gadol on the mark a mitzva leaves.
The status of Jews who are killed by goyim - are they kedoshim?
But see here [עמ' תשמ"ח והלאה] where he reaches the opposite conclusion. [Even though both articles used the same basic sources with maybe an exception or two].
Chilul Shabbos for a tinok she-nishba.
A hesped on Rav Charlap. Deeeepp. The hesped and the niftar....
And right on time [Shovavim] - dealing with the problem of הוז"ל - here and here. I personally prefer the appraoch of the first article while not totally negating that of the second.
The relationship between mitzva performance and belief.