Strengthens

Time, which strengthens friendship, weakens love.

Adversity strengthens the foundations.

They say that Zen strengthens our mind.

Swimming strengthens the legs.

Once again, Lojban is at the forefront of human creative experience - which, of course, will slow it down even as it strengthens it, like a tsunami as it approaches a shoreline.

"Anything that doesn't kill strengthens", said Nietzsche.

The smell of wisteria strengthens and restores the memory.

Physical exercise strengthens the muscles.

By the way, I found out from Yahoo's scientific newsletter that hugging regularly strengthens one's health and prolongs one's life.

Antisemitism strengthens Zionism.