He hath said in his heart, I shall not be moved (comp. Psalms 30:6). The idea of continuance is instinctive in the human mind. "The thing that has been, it is that which shall be" (Ecclesiastes 1:9).
We expect the sun to rise each day, solely because in the past it has always risen (see Butler's 'Analogy,' part 1. Psalms 1:1-6.). The wicked man, who has always prospered, expects to prosper in the future; he has no anticipation of coming change; he supposes that his "house will continue for ever, dud his dwelling-place to all generations' (Psalms 49:11); he thinks that "to-morrow will be as to-day, and much more abundant" (Isaiah 56:12).
For I shall never be in adversity; rather, unto generation and generation, I am he who will be exempt from calamity. The wicked man has no thought of dying—he will be prosperous, he thinks, age after age.