with a will

From with + a + will (“firmity of purpose, fixity of intent”), originally often used to refer to rowing a boat vigorously.

• "«Yes!» muttered the Rover, with bitter irony, as his boat rowed under the stern of the cruiser of the Crown; «yes! I, and my officers, will taste of your banquet! But the viands shall be such as these hirelings of the King shall little relish!—Pull with a will, my men, pull; in an hour, you shall rummage the store-rooms of that fool, for your reward!»"
• "So Willy and I were wedded: I wore a lilac gown; / And the ringers rang with a will, and he gave the ringers a crown."
• "Now, nobody does anything well that they cannot help doing: work is only done well when it is done with a will; and no man has a thoroughly sound will unless he knows he is doing what he should, and is in his place."
• "Swimming with his right arm, he held up his left to hail them, splashing upon the waves, and shouting with all his might. […] Backing their oars and putting the boat about, they pulled towards him with a will, and in five or six minutes from the time of his first halloo, two of the sailors hauled him in over the stern."
• "And then the whole crew bore chorus:— / "Yo-ho-ho, and a bottle of rum!" / And at the third "ho!" drove the bars before them with a will."
• "Under the wide and starry sky, / Dig the grave and let me lie. / Glad did I live and gladly die, / And I laid me down with a will."
• "Then an impromptu square dance, the men devising original figures. What merriment! Jimmy took his part with a will; this was seeing life, at least."
• "Many a reader whose appetite rejoices in hearty fare tucked in his napkin, smacked his lips and fell to with a will."
• "He got Jagu's permission to spend the slack afternoon hours at the watchmender's without any trouble – Jagu was taciturn, but good-natured – and he set to learning the craft with a will."

• resolutely

• where there is a will there is a way