Parshas Ki Seitzei: Rav Yechezkel Abramsky - Nothing In The Torah Is Too Difficult Except...
The Torah permits a soldier in the army of Bnei Yisrael to take a YifasTo'ar in war. Chazal tell us that this parsha was given because the Torah understands the limitations of a person's self control. In this case the Torah did not challenge a person to stand up to a test what It considered to be too difficult to achieve, despite the fact that these "soldiers" were all the finest YireiShamayim, who made it through the army's induction process in which all people with even minor aveiros on their resume are dismissed as inadequate!
Rav YechezkelAbramsky points out that the YifaTo'ar is the only time we find the Torah gives us leeway due to impossiblity. We see from here that anything asked of us by the Torah is possible for a person to do. Nothing is out of our reach or made for superhuman tzaddikim. Be confident and stand up to the challenge. The Torah believes in you. You can do it, you just need to believe in yourself!