I read a kitab to the nearest meanings as follows:
if we remember Allah , at the time of ease ..then Allah will remember us at time of hardships
if we remember Allah among few good believers than Allah will remember us in a congregation of angels (malaikah).
in fact it is advisable for us to engage ourselves in zikrullah at all times, so that ..our heart beats run congruently with the zikir , then .. Allah makes things easy for us at all times.
2) if we face difficulty in few important jobs , retreat towards the mercy of Allah.
Allah is forever benevolent and grace/ mercy .
Wallah hu aklam.
the best zikir is the recitation of the Holy Quraan. Read slowly, with 'tar tertila' and insya allah happiness will enshroud us back. insya allah.