Definition of "gainstriving"

[…] if in peace and quietness we are so fainthearted, that with every small breath or wind of temptation we are blown away from God, and without any gainstriving are carried headlong into all kind of wickedness and mischief?

between 1525 and 1587, a work by John Foxe, reprinted in The acts and monuments of John Foxe, volume 6, page 276