PERSEVERE, persist; hold -on, - out; die in the last ditch, be in at the death; stick to, cling to, adhere to; stick to ones text; keep on, carry on, hold on; keep to -, maintain- ones -course, - ground; go all lengths, go through fire and water; bear up, keep up, hold up; plod; stick to work (work) [See Exertion]; continue [See Continuance in action]; follow up; die in harness, die at ones post.
PERSEVERING, constant; steady, steadfast; undeviating, unwavering, unfaltering, unswerving, unflinching, unsleeping, unflagging, undrooping; steady as time; unintermitting, unremitting; plodding; industrious [See Activity]; strenuous [See Exertion]; pertinacious; persisting, persistent.
solid, sturdy, stanch or staunch, true to oneself; unchangeable [See Stability]; unconquerable (strong) [See Strength]; indomitable, game to the last, indefatigable, untiring, unwearied, never tiring.
WITHOUT FAIL; through evil report and good report, through thick and thin, through fire and water; per fas et nefas [L.]; sink or swim, at any price, vogue la galère [F.]; rain or shine, fair or foul, in sickness and in health.
Never say die.
Vestigia nulla retrorsum.
Aut vincere aut mori.
La garde meurt et ne se rend pas.
Tout vient à temps pour qui sait attendre.
If you can force your heart and nerve and sinew To serve your turn long after they are gone, And so hold on when there is nothing in you Except the Will which says to them: Hold on! Yours is the Earth, and everything thats in it.Kipling
Man, the marvellous thing, that in the dark Works with his little strength to make a light.Masefield