Another time when one is required to “chase” refers to that which it says “seek peace and chase after it!”, which means to say that if peace flees from him (for example if he is quarrelling with someone who is very tough and causes disputes and does not want peace) nevertheless he should chase after peace as peace is very great.
Similarly, when the verse says “We will know and chase to know Hashem!”, this means to say that even if a person has many obstructions in his service of Hashem and especially regarding concentration and cleaving to Hashem when his thoughts run away from him and he is unable to concentrate to the extent that it appears to him that Hashem Himself is fleeing from him and does not want him nevertheless he should not give up hope until they have mercy on him from heaven.
