'Efforts' in the Bible

What then is Apollos? And what is Paul? They are just God's servants, through whose efforts, and as the Lord granted power to each, you accepted the faith.

If any person’s work which he has built [on this foundation, that is, any outcome of his effort] remains [and survives this test], he will receive a reward.

For who regards you as superior or what sets you apart as special? What do you have that you did not receive [from another]? And if in fact you received it [from God or someone else], why do you boast as if you had not received it [but had gained it by yourself]?

for a wide door stands open before me which demands great efforts, and we have many opponents.