It can be difficult to meet others of like mind.

【mind】有时很难遇相合人。

So motivation makes a difference. There is another thing though, in addition to motivation, and that is the notion of consistency or congruence.

所以动力非常重要，除了动力外，另一样东西也会影响我们，即一致性或相合性概念。

Jonadab said to the king, " See, the king's sons have come; it has happened just as your servant said" .

约拿达对王：" 看哪，王众子都了，果然与你仆人所相合。"

For immune cells like T and B cells that means having the right ligand or surface molecule to get through the blood brain barrier, this is kind of like having the a VIP pass to get into an exclusive club.

对于免疫细胞，如T淋巴细胞和B淋巴细胞，有相合配体或表面分子就可以通过血脑屏障，有点像拥有了VIP通行权才能进入私人俱乐部。