Hello,<br/><br/>I am having some trouble with the use of the word 'essential' in the sense of "be indispensable for the sake of achieving sth," as in:<br/><br/>"Money is not essential to happiness"<br/>"Food is essential for life"<br/><br/>Are the following examples acceptable (if awkward):<br/><br/>"A car is not essential to/for your arriving on time."<br/>"Human volition is not essential to/for the end of History coming to fruition." ?<br/><br/>Thank you.