The the Eight of Cups stands for dissatisfaction and it's expressing the desire to withdraw, to walk away from a situation, to change, as we hear the calling of a new or different future. In some cases the Eight of Cups can even indicate betrayal. The Strength card symbolizes courage in the face of something that looks bigger and stronger than us. It's the inner power that conquers fear, it's the invocation of self-discipline and perseverance. The combination of the two cards could characterize a situation that we need to walk away from, but in order to do so, a fair amount of courage will be required. The combo could also indicate that a change of course is desired, but something/someone prevents us from leaving the situation behind.
The elements of the cards are Water (Eight of Cups) and Fire (Strength). Water and Fire are enemies. the Fire card, being a major arcana, will eventually win the battle and will manage to block the attempts of the Water card.