To me, my personal Teshuva, involves recognizing that Hashem has created enemies in this world. The Torah has taught me that since the beginning of the Jewish people there has been hatred of those who follow Hashems commandments. Either through jealousy or plain hatred they have oppressed us, killed us, tried to convert us, and they mocked us. The enemy is very real to the Jew, and the psalms of David HaMelech are full of descriptions of the enemy.
While Chassidus teaches that in some occasions the 'enemy' is really the yetzer hara, the force within us which drives us to do wrong. But other times the 'enemy' is clearly an external force which seeks to kill the Jewish people. We indeed have two enemies, the enemy within and the enemy without. It is wise for a Jewish man to work on his character traits through the study of Torah, since it will strengthen him in faith and trust, and he will know what he is obligated to do and not do. It is said that Torah study is the antidote to the yetzer hara, and I do believe this to be true {to an extent}...
But Torah study, as was stated before, also does bring us to believe that the Jewish peoples mission in this world is a struggle. That we are obligated to keep our side of the bargain {to keep the commandments} in order to be able to merit the blessings which are enumerated in the Torah. And alongside those very blessings we find the very curses which Hashem brings against his own people. When I recite the Shema prayer and concentrate on the words while saying 'And it will come to pass that if you continually hearken to My commandments that I command you today, to love Hashem, your G-d, and to serve Him, with all your heart and with all your soul - then I will provide rain for your land in its proper time, the early rain and late rains, that you may gather your grain, your wine, and your oil..." I think about how important it is to trust in Hashem.
The Torah is truth, so say the sages... Thus we must study Torah to strengthen ourselves, thus strengthening our brothers and sisters, and our friends and neighbors, and we strengthen our Jewish community... One leads to the next.
Again I realize everyones experience is different. May we all achieve the level of emunah we need in order to achieve our lifes goals.