Well, well...look what the cat dragged in!

So I assume you having time to come here means the essay's all written and complete?
Thomas More a selfish man? Making the declaration is straightforward; appeasing the adjudicators of reason and rationale is entirely another challenge altogether. Note that a sacrifice is not necessarily the typical trade of sorts where benefits may be exchanged, ie. swapping one form of opportunity for another form of gain. Thomas More elected to forgo wealth, power, prestige and the complementary status of elite society in order to indulge in his own obsessive penchant with law, order and the legislature apparatus to which he proffered both life and limb.
So More sacrificed his family's stature and priority of welfare to pursue his personal determinations. What did the man gain from his confrontation with State and Church? Nothing of tangible value - that much is certain. In fact, all he managed to derive from his incessant demonstrations of resistive conduct was antagonistic attention and political conflagration. More, ever the roguish deviant, suffered and had consequentially bought to bear the tirade of reprimanding injunctions upon his own family members and affiliates.
Selfish or selfless, the pudding is in the proof of citation.