'Hard' in the Bible

but bind burdens heavy and hard to bear, and lay them on the shoulders of men, but will not move them with their finger.

And he also that had received the one talent coming to him said, My lord, I knew thee that thou art a hard man, reaping where thou hadst not sowed, and gathering from where thou hadst not scattered,

Many therefore of his disciples having heard it said, This word is hard; who can hear it?

And, when we were all fallen to the ground, I heard a voice saying to me in the Hebrew tongue, Saul, Saul, why persecutest thou me? it is hard for thee to kick against goads.

Concerning whom we have much to say, and hard to be interpreted in speaking of it, since ye are become dull in hearing.

as also in all his epistles, speaking in them of these things; among which some things are hard to be understood, which the untaught and ill-established wrest, as also the other scriptures, to their own destruction.

to execute judgment against all; and to convict all the ungodly of them of all their works of ungodliness, which they have wrought ungodlily, and of all the hard things which ungodly sinners have spoken against him.