To clarify this matter (the 'Avodah' of the ‘Ovos’ which is bequeathed hereditarily to every single Jew), Avrohom’s main ‘Avodah’ is serving HaShem through Love, as stated in the Possuk: אַבְרָהָם אֹהֲבִי “Avrohom who loved me”, Yitzchok’s main ‘Avodah’ is serving HaShem through Fear, as the Possuk states: וּפַחַד יִצְחָק “Fear of Yitzchok” and Yaakov’s main ‘Avodah’ is serving HaShem through Mercy - ‘Tiferes’ and this attribute of mercy which is between love and fear, (as is explained in Tanya).
And this concept of three attributes is bequeathed to all Jews hereditarily from the three ‘Ovos’; and in each Jew, there is found all three attributes: ‘Love of HaShem’, ‘Fear of HaShem’ and ‘Mercy’ (which is the attribute of ‘Tiferes’).
And furthermore, this concept is part of our everyday ‘Avodah’; viz at the beginning of the ‘Amidah’ where we say ‘The G-d of Avrohom, the G-d of Yitzchok and the G-d of Yaakov’, because every day in prayer we express all three of these attributes in our Avodoah.
As a consequence; this ‘Avodah’ also leads to action, as for example in Love, because when one stimulates a revealed love of HaShem within oneself (via appropriate meditations), it motivates one towards action; to do that which HaShem [whom he loves], loves and wants.
Similarly, in ‘Yiras HaShem’, because of the fear and the awe which is in the heart, one abstains from doing anything which is contrary to HaShem’s desire, which is not just due to fear of punishment or any similar side-effects but stems from the Fear and Awe of HaShem’s very existence.
Similarly, it is the same with regards to the attribute of Mercy; that after one contemplates all the concepts (relating to HaShem’s greatness) one comes to a conclusion that as much as one understands, it will always be completely inconsequential, (in comparison to what there is to know) and this leads to a feeling of great pity for the soul. And in addition to this in contemplation of the fact that one cannot fathom how pitiful the state of His soul really is, and with that one pleads with HaShem to have great pity on oneself (as we say in the blessings of the Shema) “In Your abounding mercies have compassion upon us”, that one arouses great mercy from up above, which is the theme of Yaakov, (as mentioned earlier) and this compassion motivates one, physically, to do something about it.
