Strife means rivalry, conflict, discord or antagonism. Archaically, strife means strenuous effort. The antonym of strife is peace.

Is Picatrix the inspiration for Crowley changing the name of the Strength card to Lust?

The Five of Wands suggests growing pains. The action has increased to the point that it is being noticed, and not necessarily appreciated by others. Now is the time to take more aggressive action to ensure that the actions succeeds. Testing the action to see that it is strong enough. Product testing. Testing to destruction.

Book of Thoth – Strife

In the “Naples arrangement”, the introduction of the number Five shows the idea of motion coming to the aid of that of matter. This is quite a revolutionary conception; the result is a complete upset of the statically stabilized system. Now appear storm and stress.

This must not be regarded as something “evil”. The natural feeling about it is really a little more than the reluctance of people to get up from lunch and go back to the job. In the Buddhist doctrine of Sorrow this idea is implicit, that inertia and insensitiveness must characterize peace. The climate of India is perhaps partly responsible for this notion. The Adepts of the White School, of which the Tarot is the sacred book, cannot agree to such a simplification of existence. Every phenomenon is a sacrament. For all that, a disturbance is a disturbance; the five of Wands is called Strife.

Irrational energy that is impossible to control.

Magical Image of the First Face of Leo in Picatrix

In the first face of Leo ascends a man riding on a Lion; it signifies boldness, violence, cruelty, wickedness, lust and labours to be sustained.

The first or Ascendant decan of Leo ruled by Saturn from July 23rd-August 2nd

Perhaps this was the image that inspired Crowley to rename Strength to Lust?