John Gill Commentary Genesis 31:6

"And ye know that will all my power I have served your father." — Genesis 31:6 (ASV)

And you know, that with all my power I have served your
father .
] With all faithfulness and uprightness; with all diligence and industry; with all wisdom and prudence; with all my might and main, contriving the best methods, and sparing no pains by day or night to take care of his flocks, and increase his substance.

Of this his wives had been witnesses for twenty years past, and to them he appeals for the truth of it; so that there was no just reason for their father's behaviour towards him.