From Alexander the Platonist I learned not to tell people 'I'm too busy' unless it's truly necessary. Don't use the excuse of urgent business to avoid the duties you owe to friends and others in your life.
Of Alexander the Platonic, not often nor without great necessity to say, or to write to any man in a letter, 'I am not at leisure'; nor in this manner still to put off those duties, which we owe to our friends and acquaintances (to every one in his kind) under pretence of urgent affairs.