A conservative is terrified of the future and clings to the past for its comfort and wisdom, even if it must be imagined.
A liberal is horrified at the injustice of the past and looks to transform society in order to void the presence of those injustices in the future, even if the results of the changes are speculative – at best.
We need both conservatives and liberals, for otherwise our lifeboat will tip over and drop us amongst the sharks.