What is the meaning of "Ki Asisa"?
Rashi: When You will do this for me. He speaks to Hashem.
Radak: When You will do justice for me against Do'eg. He said this with Ru'ach ha'Kodesh.
Sha'arei Teshuvah (4:12): I will thank You for the good that You did for me, and due to this, I hope that Your good [to me] will be constant.
Malbim: I will constantly thank You for the past, for Hashem's miracles are constant. I will always have new praise for good that You do to me.
What is the meaning of "Akaveh Shemecha"?
Radak: I will make people hope to Your name; I will inform in front of Your Chasidim that it is good.
Sha'arei Teshuvah: Refer to 52:11:1:3.
Malbim: I will hope to Your name, that You will do Chesed in front of Your Chasidim, who are prepared for Chesed.